Tag Archives: Eric Fevre

The spatial ecology of pigs: Where free-range doesn’t come free

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A report on the economic as well as health risks of keeping free-range pigs in western Kenya has been published by scientists in the animal health laboratories at ILRI’s Nairobi, Kenya, campus; here, two of the authors, lead author Lian Thomas (left) and principal investigator Eric Fèvre (right), inspect a household pig in their project site, in Busia, in western Kenya (photo credit: ILRI/Charlie Pye-Smith).

Like your livestock products to come from free-range systems? Consider that a healthy alternative to the factory farming of livestock? Consider the lowly pig, and what serious pathogens it can pick up, and transmit to other animals and people, in the course of its daily outdoor scavenging for food. Consider also the scavenging pig’s coprophagic habits (consumption of faeces) and you may change your mind.

A recent study has brought those habits to light. The study was conducted in an area surrounding Busia town, in western Kenya (Busia lies near Kenya’s western border with Uganda; Lake Victoria lies to the south). The study was conducted by scientists at the International Livestock Research Institute (ILRI) and the University of Edinburgh to better understand the transmission of several pathogenic organisms. This is the first study to investigate the ecology of domestic pigs kept under a free-range system, utilizing GPS technology.

Most people in Busia farm for a living, raising livestock and growing maize and other staple food crops on small plots of land (the average farm size here is 0.5 ha). More than 66,000 pigs are estimated to be kept within a 45-km radius of Busia town.

ILRI's Lian Thomas with pig in western Kenya

ILRI’s Lian Thomas with a household pig in western Kenya (photo credit: ILRI/Charlie Pye-Smith).

A GPS collar was put on 10 pigs, each nearly 7 months old, that were recruited for this study. A handheld GPS unit was used to obtain the coordinates of the homesteads to which the selected pigs belonged; the perimeters of the homesteads and their main features, including human dwellings, cooking points, rubbish disposal areas and latrines, were all mapped. The pig collars recorded the coordinates of the pigs every 3 minutes during the course of one week.

All the 10 pigs were kept under free-range conditions, but also regularly fed supplementary crop and (mostly raw) household waste. All the pigs recruited were found to be infected with at least one parasite, with most in addition also having gastrointestinal parasites, and all carried ticks and head lice.

The pigs, which scavenge both day and night, were found to spend almost half their time outside the homestead, travelling an average of more than 4 km in a 12-hour period (both day and night), with a mean home range of 10,343 square meters. One implication of this is that a community approach to better controlling infectious diseases in pigs will be better suited to this farming area than an approach that targets individual household families.

Three of the ten pigs were found to be infected with Taenia solium, a pig tapeworm whose larva when ingested by humans in undercooked pork causes the human disease known as cysticercosis, which can cause seizures, epilepsy and other disorders, and can be fatal if not treated. T solium infection in pigs is acquired by their ingestion of infective eggs in human faecal material, which is commonly found in the pigs environments in rural parts of Africa as well as Mexico, South America and other developing regions.

This study found no correlation between the time a pig spent interacting with a latrine at its homestead and the T solium status of the pig. The paper’s authors conclude that ‘the presence or absence of a latrine in an individual homestead is of less relevance to parasite transmission than overall provision of sanitation for the wider community in which the pig roams’. With a quarter of the homesteads in the study area having no access to a latrine, forcing people to engage in open defecation, and with less than a third of the latrines properly enclosed, there are plenty of opportunties for scavenging pigs to find human faeces.

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A typical household scavenging pig and pit latrine in the project site in Busia, Kenya (photo credit: ILRI/Charlie Pye-Smith).

Improved husbandry practices, including the use of effective anthelmintics at correct dosages, would enhance pig health and production in this study area.

One of the interesting findings of the study is that all this pig roaming is likely to be helping to reduce the weight of the pigs at slaughter. Mean live weights at the abattoir in the Busia area are 30 kg, giving a dressed weight of only 22.5 kg and earning the farmer only KShs.2000–2500 (USD24–29) per animal.

Encouraging the confinement of pigs is likely to improve feed conversion and weight gain, by both reducing un-necessary energy expenditure as well as limiting parasite burden through environmental exposure.

‘Confinement of pigs would also reduce the risk of contact with other domestic or wild pigs: pig to pig contact is a driver of African swine fever (ASF) virus transmission. ASF regularly causes outbreaks in this region . . . . Confining pigs within correctly constructed pig stys would also reduce the chances of contact between pigs and tsetse flies.’ That matters because this western part of Kenya is a trypanosomiasis-endemic area and pigs are known to be important hosts and reservoirs of protozoan parasites that cause both human sleeping sickness, which eventually is fatal for all those who don’t get treatment, and African animal trypanosomiasis, a wasting disease of cattle and other livestock that is arguably Africa’s most devastating livestock disease.

In addition, both trichinellosis (caused by eating undercooked pork infected by the larva of a roundworm) and toxoplasmosis (caused by a protozoan pathogen through ingestion of cat faeces or undercooked meat) are ‘very real threats to these free-ranging pigs, with access to kitchen waste, in particular meat products, being a risk factor for infection. Such swill is also implicated in ASF transmission’.

While confining pigs would clearly be advantageous for all of these reasons, the practice of free range will likely be hard to displace, not least because this low-input system is within the scarce means of this region’s severely resource-poor farmers. Local extension services, therefore, will be wise to use carrots as well as sticks to persuade farmers to start ‘zero-scavenging’ pig husbandry, Fortunately, as this study indicates, they can do this by demonstrating to farmers the economic as well as health benefits they will accrue by penning, and pen-feeding, their free-ranging pigs.

Scavenging pigs in Busia, western Kenay

Scavenging pigs in Busia, western Kenya (photo credit: ILRI/Charlie Pye-Smith).

Project funders
This research was supported by the Wellcome Trust, BBSRC (Biotechnology and Biological Sciences Research Council) and MRC (Medical Research Council), all of Great Britain. It is also an output of a component of the CGIAR Research Program on Agriculture for Nutrition and Health investigating Agriculture-Associated Diseases.

Read the whole paper
The spatial ecology of free-ranging domestic pigs (Sus scrofa) in western Kenya, by Lian Thomas, William de Glanville, Elizabeth Cook and Eric Fèvre, BMC Veterinary Research 2013, 9:46. doi: 10.1186/1746-6148-9-46

Article URL
http://www.biomedcentral.com/1746-6148/9/47  The publication date of this article is 7 Mar 2013; you will find here a provisional PDF; fully formatted PDF and full text (HTML) versions of the paper will be available soon.

About the project
Begun in 2009 and funded by the Wellcome Trust, with other support from ILRI, this project has studied neglected zoonotic diseases and their epidemiology to raise levels of health in poor rural communities. The project, People, Animals and their Zoonoses (PAZ), is based in western Kenya’s Busia District and is led by Eric Fèvre, who is on joint appointment at ILRI and the University of Edinburgh. More information can be found at the University of Edinburgh’s Zoonotic and Emerging Diseases webpage or on ILRI’s PAZ project blog site.

The May 2010 issue of the Veterinary Record gives an excellent account of this ambitious human-animal health project: One medicine: Focusing on neglected zoonoses.

Related stories on ILRI’s AgHealth, Clippings and News blogs
Tracking of free range domestic pigs in western Kenya provides new insights into dynamics of disease transmission, 22 Mar 2013.
Aliens in human brains: Pig tapeworm is an alarming, and important, human disease worldwide, 23 May 2012.
Forestalling the next plague: Building a first picture of all diseases afflicting people and animals in Africa, 11 Apr 2011. This blog describes an episode about this project broadcast by the Australian science television program ‘Catalyst’; you can download the episode here: ABC website (click open the year ‘2011’ and scroll down to click on the link to ‘Episode 4’; the story starts at 00.18.25).
Edinburgh-Wellcome-ILRI project addresses neglected zoonotic diseases in western Kenya, 28 Jul 2010.

Livestock in the city: New study of ‘farm animals’ raised in African cities yields surprising results

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Urban zoonoses and food safety: Nairobi

Leonard Gitau, a small-scale livestock farmer in Dagoretti, Nairobi, speaks to journalists during a media tour by ILRI of urban farmers in Nairobi on 21 Sep 2012 (photo credit: ILRI/Paul Karaimu).

For the first time in history, more people are living in cities than rural areas. Many of them still keep livestock. At least 800 million people in cities in developing countries practice urban agriculture, from growing vegetables to keeping camels—often in close confinement in densely populated areas.

The benefits of urban livestock keeping are many: from improved food security, nutrition and health from livestock products, creation of jobs and protection from food price volatility. But the risks in urban livestock are also large: unsanitary conditions and weak infrastructure mean that livestock can be a source of pollution and disease.

‘Zoonoses’, diseases transmitted between animals and people, are a global health problem that particularly affects the poor in developing countries. A new study by the International Livestock Research Institute (ILRI) and partners finds that zoonoses and diseases recently emerged from animals make up 26% of the infectious disease burden in low-income countries, but just 0.7% of the infectious disease burden in high-income countries.

The study, published in the journal Tropical Animal Health and Production, which was led by University of Nairobi and ILRI, is part of a series of papers that examine the facts and fiction of urban livestock keeping. The researchers note the need for evidence in the planning and practice of urban food systems and the danger of relying on perceptions or models taken from different contexts.

Here are some of the results of the study.

LOTS OF URBAN LIVESTOCK
Much more livestock is being raised in the urban areas of developing countries than most people (and policymakers) think.

THE DISEASE RISK
Domestic as well as wild animals can spread many, and some very serious, diseases to people and it is a reasonable assumption that as the population of urban areas of these and other developing countries continues to increase, the risk of zoonoses also increases.

THE GOOD NEWS
This recent in-depth study of urban zoonoses in urban environments in Nigeria and Kenya suggests that the human disease risk posed by raising, processing, marketing and/or consuming livestock in cities, city suburbs and big towns in developing countries is less than we might think.

SUPPORT INFORMAL MARKETS
Rather than bar poor people from livestock enterprises in urban areas in an attempt to protect public health, which could do the poor more harm than good, this study suggests that a more practical and equitable course is to work to enhance practices in small-scale urban livestock raising and informal livestock marketing by encouraging poor livestock producers, processors and sellers to upgrade some of their practices.

PROVIDE INCENTIVES FOR GOOD BEHAVIOUR
This study included participatory work with the local communities, and an important outcome has been the success achieved by creating incentives for the poor to improve their livestock practices rather than trying to strictly regulate these informal livestock markets, or harass the people involved, or bar them from operating altogether.

DISEASE RISKS ARE NOT WHAT WE THINK
Another important finding is that people are not the good judges of risks that they think they are; most people, including food safety officials, think that livestock foods, being so perishable, carry the greatest risk of disease in informal urban markets, but studies have shown that, for example, city vegetables are often a greater cause of disease concern than milk and meat.

TRACKING PATHOGENS AND RELATED ILRI RESEARCH
This research project was conducted jointly with the University of Nairobi, whose Professor Erastus Kang’ethe led the data collection and participatory work within Kenya, with the support of the Kenyan government and health officials. This project also expands ILRI’s long-standing research on informal dairy markets in East Africa and South Asia, led by ILRI scientist Amos Omore and others, which helped to refine dairy policies to support rather than harass sellers of ‘raw’ (unpasteurized) milk. And a new ILRI research project led by ILRI scientist Eric Fevre will investigate zoonoses further by tracking disease pathogens as they move among farms, processors and markets in Nairobi.

Urban zoonoses and food safety: Nairobi

ILRI scientist Delia Grace is interviewed by BBC and AllAfrica.com before the start of a journalist tour of urban livestock farmers in Nairobi that ILRI organized on 21 Sep 2012 (photo credit: ILRI/Paul Karaimu).

Delia Grace, an ILRI veterinary epidemiologist and leader of a component of the CGIAR Research Program on Agriculture for Nutrition and Health, was the principal investigator in the Ibadan-Nairobi zoonoses study and editor of this special edition of Tropical Animal Health and Production. Grace says that regulations that work for rich countries do not always work for poor countries, and that policies should follow a risk-based approach where decision-makers’ focus is not the bugs present in food but the likely effects on human health. ‘The risks of food-borne diseases’, she says, ‘need also be weighed against the economic benefits and nutrition abundantly supplied by animal products.’

In the absence of evidence, policies are based on the prejudice that urban livestock keeping is unsafe and unmodern, and it is often banned outright. Of course it continues behind hedges and in back alleys, but the imposed illegality drives a rush to the bottom in hygienic practices and investments. When farmers are harassed by authorities and operate in a legal grey area, they have little access to the support they need and little incentive to invest in business improvements.

Thanks in part to previous research on the benefits of urban agriculture, the Government of Kenya has been proactive in posting veterinary, animal production, and crop personnel in major urban centers to lead from the front in championing the development of urban agriculture. The government has also led in the development of the urban agriculture and livestock policy. Involving these civil servants has been key in enabling our research in urban agriculture. This is a good example of government changing its policy to better meet the needs of citizens.

Rapid urbanization, and along with it the urbanization of poverty and food insecurity, raises urgent challenges for the global research and development community. Among them is the need to manage the growing risks of zoonosis associated with urban farming and to improve food safety for the one billion of the world’s poor living in cities, most of whom depend on informal markets instead of more formal government-organized markets or grocery stores.

Informal, or wet markets, exist in many different forms across Africa and Asia but have common characteristics: food escapes effective health and safety regulation; many retailers do not pay tax and some are not licensed; traditional processing, products and retail practices predominate; infrastructure such as water, electricity, sanitation, and refrigeration is lacking; and little support is provided from the public or non-governmental sector. Unsurprisingly, women and the poor are involved most in informal markets.

Applying an innovative research approach known as ‘ecohealth’, the findings of this research contradict some basic assumptions about zoonoses and urban farming and show how livestock keepers in one of Africa’s biggest cities, Nairobi, Kenya, are transforming their livestock and public health practices to combat disease and help feed a city where 60% of the population lives in slums.

But what does it mean in practice? A special edition of 11 papers sets out how ecohealth approaches can make a difference to city health. The researchers base their findings from two case studies. One is in Dagoretti, a Nairobi district of some 240,000 residents, and analyzes the emerging zoonoses cryptosporidiosis, a diarrhoeal disease that is passed from cattle to humans.

For further information

See a Factsheet on Urban Agriculture and Zoonoses in Nairobi, which provides key facts about urbanization, urban livestock keeping and the study in Dagoretti, where most residents are poor and many raise livestock inside city limits.

Read the special supplement of the August 2012 issue of the journal Tropical Animal Health and Production on assessing and managing urban zoonoses and food-borne disease in Nairobi and Ibadan.

Featured in the special supplement are the following 10 research articles by scientists from the International Livestock Research Institute (ILRI) and partners from the Kenya Agricultural Research Institute (KARI), the Kenya Ministry of Agriculture, the Federal University of Agriculture, Abeokuta, the University of Ibadan and the University of Nairobi.

Click on the links below to read the abstracts of the articles (ILRI authors in burgundy; journal subscription required for access to full text).

Forestalling the next plague: Building a first picture of all diseases afflicting people and animals in Africa

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Typical mixed crop-livestock farming of western Kenya

An ILRI-Wellcome project is investigating the disease pathogens circulating in both people and animals in the communities outside the border town of Busia, Kenya, where smallholders mix crop growing with livestock raising (photo credit: ILRI/Pye-Smith).

A project funded by the Wellcome Trust on zoonotic diseases was broadcast last week on an Australian television program called ‘Catalyst’. The show ran on Thursday, 10 March 2011, at 20:00 Australian time. The research described in the program is supported by the International Livestock Research Institute (ILRI), where the project’s principal investigator, Eric Fevre, is hosted.

The television program interviews Fevre and his colleagues Lian Doble, a veterinarian managing laboratory work in western Kenya, and  Appolinaire Djikeng, technology manager of a Biosciences eastern and central Africa (BecA) Hub, located on ILRI’s Nairobi, Kenya, campus.

Fevre and Doble and their team are investigating what disease pathogens of both people and animals are circulating near the border town of Busia, a very poor, densely populated area whose communities mix crop growing with livestock raising on small plots of land. Research such as this that is looking at both human and animal diseases is rare but urgently needed because the close relations of people and farm animals in many poor regions, as well as the existence of monkeys and other wildlife nearby, is a ‘recipe for diseases’ jumping from animals to people. If we’re going to manage to forestall another zoonotic plague such as bird flu or HIV/AIDS, we’re going to have to conduct more of such ‘one health’ investigations that look at exactly what diseases are being transmitted between animals and people. The research project in western Kenya is part of a larger study being conducted by the BecA Hub to look at diseases of animals and people across eastern Africa. The BecA Hub team is using genomics and meta-genomics, and ‘4 million bucks of computing power,’ to build a picture of the complex relations of disease pathogens circulating in the region.

Eric Fevre and pit latrine in Busia, Kenya

Eric Fevre, who leads the ILRI-Wellcome project investigating the disease pathogens circulating in both people and animals in Busia, points out a pit latrine frequented by pigs as well as people, where disease transmission between the two species is most likely to occur (photo credit: ILRI/Pye-Smith).

A transcript of the Australian television program on this research follows.

NARRATION
Africa, the cradle of humanity and renowned for its wildlife. It could also be the origin of the next global pandemic. It’s long been known that people and animals living close together—well, that’s a recipe for disease. But exactly which diseases? And if new diseases are creeping into the system? Well, that’s something they’re trying to find out here in western Kenya. They’re called zoonotic diseases: infections that can jump from animals to people.

Eric Fevre
There are lots of zoonotic infections. In fact, about 60 per cent of all human diseases are of zoonotic origin.

NARRATION
So this team headed by Eric Fevre is taking a much closer look at the health of people and livestock in a densely populated region of western Kenya.

Eric Fevre
It seems to be obvious that zoonotic infections will occur more in people who keep livestock than in those who don’t. Whether that’s the case has never been formally established.

Lian Doble
If you look around here you don’t see the cattle in a field, in a fenced field or in a barn away from the people. Cattle are tethered within the compound that everybody’s working in, the chickens are loose around, going in and out of the houses. It’s a much more integrated system than anything we really see at home.

NARRATION
The kinds of problems that this environment creates are readily apparent.

Eric Fevre
We’re in a mixed crop-livestock production system where people are keeping a few animals. And as you can see behind me here, it’s the rainy season and people have recently planted their new crops. And this is an area of interaction between the croplands and the animals. And you can see behind over there behind those fields is some forest. And there might be a watercourse flowing through that forest, for example, where the animals are going to water. And that’s where the exciting things happen from a disease transmission point of view.

NARRATION
Part of the team focus on human health, taking a range of samples from people in the village as well as a detailed account of their medical history and current living situation. Meanwhile, others in the team have a look at the livestock.

Lian Doble
What we do know is that there are a large number of diseases that circulate between animals and humans. The problem is that a lot of these diseases cause signs which are very similar to other human diseases like malaria and human tuberculosis. What isn’t known is actually how many of the diseases that are mainly diagnosed as malaria actually are another disease caused by the pathogens found in cattle. So we’re just trying to find out what diseases she has and what are shared with the people that she lives with.

Paul Willis
And does she look healthy?

Lian Doble
She’s feisty and she’s quite healthy so we’ll see what she might have been carrying. And we can tell you later in the lab.

NARRATION
Samples are taken back to field laboratories in the town of Busia on the Ugandan border.

The ILRI-Wellcome Trust laboratory in Busia, Kenya

The ILRI-Wellcome Trust animal-human laboratory in Busia, Kenya (photo credit: ILRI/Pye-Smith).

Eric Fevre
In this place we’ve got a human and an animal lab next door where we process the material that comes in from the field. One of the things that we really need to do is look at fresh material. Because once the samples get a bit old, the parasites become a bit difficult to identify. And the second important thing is that we of course feed back to the participants of our study. So results that we get in the lab here are used directly by the clinicians working in the field to decide what treatments they should be giving people. So that’s one of the direct ways that our research project feeds back into the community.

NARRATION
This detailed look at the community health of a whole region is showing many expected results, and a few surprises.

Eric Fevre
One of the diseases that we’re testing for is brucellosis. And looking at the official reports there isn’t any brucellosis in this region. But we have detected brucellosis both in animals and in people and so already that’s what’s telling us that there are things circulating here that official records don’t pick up.

NARRATION
There seems to be a lot of malaria around, but Eric’s team are finding that many cases are masking something much more sinister.

Eric Fevre
Often it won’t be malaria. It will be something else. And there are a multitude of different pathogens that cause fever of the type that malaria also causes. And that’s a real problem. Because somebody with a low income might need to, say, sell one of their animals to then go to the clinic, get a diagnosis, buy some anti-malarial drugs. They don’t work because the person actually has sleeping sickness. So they go back to a different clinic. Or to a traditional healer. They get drugs that don’t work for the infection that they have. And so on and so on, five, six, seven times, travelling maybe ten kilometres each time. That’s a huge economic burden on them. And then finally they get properly diagnosed when they’re in the late stage of their infection. And it would have been much easier to treat them if they’d have been caught earlier on.

NARRATION
It’s a very complex picture that is emerging, one that could be simplified by some basic technology.

Lian Doble
Thirty per cent of our participants don’t have access to a latrine. You can imagine what that means. And that’s something that could be very actually quite easily sorted out with some education and some money and would sort out all sorts of other diarrhoeal diseases, which are one of the huge killers of young children in Africa.

Biosciences eastern and central Africa hub platform

One of the ultra-modern laboratories at the Biosciences eastern and central Africa (BecA) Hub ‘platform’ hosted and managed by ILRI in Nairobi, Kenya (photo credit: ILRI/White).

NARRATION
Back in Nairobi another team is taking a different look at the spread of diseases across east Africa.

NARRATION
Appolinaire Djikeng heads up a team collecting samples of animals and people from a wide swath across Kenya.

Appolinaire Djikeng
So essentially at the moment we are trying to cover the east African region. But of course we would like to once we establish our processes and data management skills and data analysis skills we like to expand this to other parts of Africa.

NARRATION
The first step in the labs is to figure out exactly what spread of diseases are present in their samples.

Appolinaire Djikeng
You are able to go in there, look at the, the complex composition of the viruses, at the pathogens or at the small organisms that exist in them in doing it that way you are able to come up with a catalogue of potential organisms that exist in there.

NARRATION
And this analysis goes deep into the DNA of the viruses and pathogens that are found, tracking minute changes in their genetic make-up that allows Appolinaire’s team to follow the spread of individual strains of a disease.

Appolinaire Djikeng
We have a reasonably good bioinformatic infrastructure here for storing that data and extracting them, looking at specific parameters from that particular data base. With so many samples from such a wide geographical area and with so much information for each individual sample these guys are dealing with a lot of data and so they brought in four million bucks worth of computing grunt. With so many samples from such a wide geographic area and with so much information for each individual sample these guys are dealing with a lot of data. So they brought in four million bucks worth of computing grunt.

NARRATION
There are several teams looking at zoonotic diseases in Kenya, but the impact of their work is global.

Appolinaire Djikeng
The threat of emerging and re-emerging infectious diseases are no longer restricted to countries like central Africa or sub-Saharan Africa So I think now we have to put this work in the context of the global effort across the world. Trying to make sure that even remote parts of the area do have resources and capabilities to begin to do good and accurate diagnostics of what could be emerging.

Eric Fevre
We actually use the data that we gather to, to try and understand how these things are being transmitted, how the fact that your animal has this disease impacts on your risk at a population scale. And, and use that to then try and understand the, the process of transmission of these diseases.

Lian Doble
The next big disease problem is very likely to be a zoonotic disease so doing this sort of work and then leaving it isn’t an option. It needs to be ongoing and, and build. This is the start of something and we’ll build on it from here.

Download this Catalyst show from Australia’s ABC website (select ‘Zoonosis’ 10/3/2011).

And check out a blog by Paul Willis about the adventures of filming in Kenya’s border town of Busia: Coming to an end, 7 March 2011.

Here’s some of what Paul Willis has to say in his blog about this film project:
‘Busia is a hard place; a border crossing town riddled with grinding poverty and hard living. The main street, the only sealed road through town, is frequently clogged with a seemingly endless string of trucks waiting to cross the border into Uganda. Because Uganda, Rwanda and Burundi are all landlocked nations, every drop of fuel and most freight coming into the country has to be trucked in from Mombasa and most of that comes through Busia. . . . This area of Kenya has some of the most intensively farmed land in East Africa. The whole landscape is divided into small plots with clusters of mud and thatch huts scattered among them. Here people live cheek-by-jowl with their crops and animals. It’s a recipe for diseases to jump from animals to people. Add strips of forested vegetation inhabited by a variety of monkeys and other native mammals and the chances of new diseases leaping into the human population goes up dramatically. We’re here to report on the work of a dedicated group trying to get a handle on exactly what diseases are in this chaotic system. It’s hard work, in one of the hotter areas of Kenya, and the study is spread over a huge area. . . .’

Edinburgh-Wellcome-ILRI project addresses neglected zoonotic diseases in western Kenya

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Woman Feeding Cow

‘Neglected diseases are diseases of neglected peoples’—Eric Fèvre

Animals and people live close together throughout the developing world. Chickens, goats, pigs, cows and other farmed animals range freely in and out of rural homesteads as families go about their daily lives. This space-sharing by people and their livestock makes good use of the small plots of land managed by the world’s many smallholder farmers; food that might otherwise go to waste can be fed to the animals, for example, while animal manure feeds the cropland by fertilizing it. Most of the world’s smallholder farmers depend on their animals for milk, meat and eggs to feed their families, with the surplus generating much-needed regular household income.

However, such close proximity to their animals puts many people at risk of ‘zoonotic’ diseases, which are those transmitted between people and animals. Remarkably, more than 60% of all human diseases are infections they can get from animals and more than 70% of today’s emerging diseases, such as bird flu, are zoonotic.

Because human and animal health are particularly intertwined in poor countries where people and livestock live in such close proximity, efforts to improve human health in the developing world need to focus on improving animal as well as human health. This makes it necessary for medical and veterinary experts to collaborate and for livestock farmers and herders to be made aware of the disease risks their animals pose to the health of their households.

A project begun in 2009 and funded by the Wellcome Trust, with other support from the International Livestock Research Institute (ILRI), is studying neglected zoonotic diseases and their epidemiology to raise levels of health in poor rural communities. The project, People, Animals and Their Zoonoses, is based in Kenya’s Busia District, which sits on the country’s western border, with Uganda.

Eric Fèvre, who is working jointly for the International Livestock Research Institute (ILRI) and the University of Edinburgh, is the project’s principal investigator and leader. Fèvre says this study is important.

‘Zoonotic diseases are a great burden on poor communities’, Fèvre says. ‘In a poor household where animals and people are in regular close contact, there is a significant chance of zoonotic diseases spreading. Typically in such areas, animals have access to human waste, there is little preventative health services for livestock and there is poor-quality food and forage for people and animals.’

With insufficient and/or unreliable health infrastructure and with many poor people not readily seeking professional medical attention, these diseases often go underreported or misdiagnosed. Complicating and aggravating this already serious health situation, he says, is that ‘in some cases, other non-zoonotic infections may already be present.’

Furthermore, as reported in the May 2010 issue of Veterinary Record, Fèvre says:

‘While malaria is undoubtedly a very serious health issue, its overdiagnosis hides many other problems. To compound this, people in marginalised communities can easily fall off the policy radar – many may be born, live and die without official record being made of them and, as such, they have a weak, or nonexistent, political voice. Thus, while the diseases are grouped as “neglected zoonotic diseases,” it would be equally correct to identify them as “diseases of neglected populations”.’

The Kenya zoonotic study is a four-year project that brings together ILRI scientists in Kenya with researchers from the School of Biological Sciences at the University of Edinburgh and from the Kenya Medical Research Institute, the latter of whom are already working in much of Kenya’s Western and Nyanza provinces. These epidemiologists, veterinarians, medical health professionals and laboratory technologists will visit over 500 homesteads in Busia to collect data and samples from people and livestock; those people found ill will be treated or referred to specialists.

The project data will be used to quantify the place of zoonoses in the context of other infectious diseases and to refine our understanding of factors that put people and livestock at risk. The study team also aims to come up with diagnostic tests that can be used in the field and to design cheap, easy-to-implement health interventions for both people and livestock. The project is focusing on bovine tuberculosis, cysticercosis, brucellosis, Q-fever, Rift Valley fever and trypanosomiasis (in cattle) /sleeping sickness (in people) and their impacts on both livestock and the people.

The results of this project are expected not only to improve the health aspects of the relationship between people and their livestock in western Kenya but also to provide important background for future research and policymaking on zoonotic issues.

More information can be found at www.zoonotic-diseases.org

The May 2010 issue of the Veterinary Record gives an excellent account of this ambitious human-animal health project: http://veterinaryrecord.bvapublications.com/misc/about.dtl (subscription required).

Serengeti surely SHALL die if a proposed highway bisects its northern wilderness—and if its human neighbours remain poverty-stricken

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Zebra and wildebeest in the Masai Mara Game Reserve

Zebra and wildebeest in Kenya’s Masai Mara Game Reserve (photo credit: ILRI/Elsworth).

The New York Times and other media are reporting this week that one of the greatest wildlife spectacles on earth—the annual migration of nearly 2 million wildebeest and zebra from the drying savannas of the Serengeti, in Tanzania, to the wetter, greener, pastures of Kenya’s adjacent Masai Mara, and back again—is threatened by a proposed new national transit road for northern Tanzania that would cut right across the migration route of these vast herds of ungulates, likely leading to the collapse of this migration and possibly the crash of this ecosystem as a whole.

Kenya’s Masai Mara is the only year-round water source in the Greater Serengeti, and thus serves as critical dry-season grazing grounds for these vast herds of big mammals.

Just one of the problems such a road would bring is a greater disease burden to people, livestock and wildlife alike. In her extensive and useful research notes to her recent article, ‘Road Kill in the Serengeti’, in the New York Times, Olivia Judson refers readers to a scientific paper written by Eric Fevre, of the Zoonotic and Emerging Diseases research group at the University of Edinburgh, now based at the International Livestock Research Institute (ILRI) in Kenya while working on a 3-year human-animal disease research project in Busia District. Fevre describes the spread of animal diseases through animal transportation in his article, ‘Animal movements and the spread of infectious diseases’ (Trends in Microbiology, 2006).

Perhaps just in time, just this month former ILRI ecologist Robin Reid, now director of the Center for Collaborative Conservation at Colorado State University, in Fort Collins, USA, began a project in Kenya that is putting radio collars on wildebeest to learn more precisely what routes the animals take in their migration. This project’s members are involving Maasai schoolchildren, who are naming the wildebeest, which they will then be able to follow. The wildebeest collars send regular tracking signals to Safaricom, which are then sent to Colorado, where the routes are posted on a web map that the schoolchildren can follow.

This year’s annual wildebeest migration has already begun. Herds are reported to have crossed the common border of Kenya/Tanzania from Northern Serengeti into Masai Mara, about 4 days ago. ‘What has been unusual about this year’s migration,’ says Paul Kirui, in the Masai Mara, ‘is that the main migration from the south arrived in the Mara early ahead of the Loita herds—the Kenyan resident herds of wildebeest—which usually migrate into the Mara from the east of the park. Normally when we start seeing them move into the park, it is a sign that the main migration from the south is on the way.’

The first population of wildebeest that Reid’s team darted and then tagged with radio collars in the Mara is the Loita group that remains resident in Kenya all year round. Or so the researchers think. The radio collars, now fixed on the first 15 wildebeest, have already started to report back and will be letting scientists, and those schoolchildren, know just where they go, and when.

Reid’s return gave ILRI cause to revisit two remarkable films about her ILRI research in the Mara. Counting in a Disappearing Land (ILRI, 11 minutes, 2007) describes Reid’s project with a Maasai community that has traditionally herded their livestock in Kenya’s wildlife-rich Masai Mara region. This ILRI project was looking to find ways of balancing the needs of people, lands and wildlife. In The Great Migration (CBS ’60 Minutes’, 15 minutes, October 2009), Scott Pelley interviews Reid about the threats to this natural spectacle and the part local Masai are playing to address these threats.

Collaborative conservation may indeed be the answer to saving the Serengeti ecosystem. Protecting majestic wild places and the wildlife they support, places that instill wonder in us, matters, of course, but so does protecting millions of people from severe poverty, chronic hunger and the afflictions that come in their wake: disease and untimely death.

With a large percentage of its land area under protection, Tanzania is a world leader in biodiversity conservation. It is also very, very poor. How this tug at resources—whether the Serengeti Plains will be used for wildlife tourism or other kinds of commerce—will play out may depend on how much the local communities living in poverty near the wildlife benefit from saving this, the last of the great migrations of big mammals on Earth.

More . . . (New York Times, 15 June 2010)

An alternative, southern road in Tanzania is discussed on a webpage of the Frankfurt Zoological Society.

See Paul Kirui’s blog on 17 June 2010 the migration on Masai Mara Updates.