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Gerken KN, Ndenga BA, Owuor KO, Winter CA, Seetah K, LaBeaud AD. Leveraging livestock movements to urban slaughterhouses for wide-spread Rift Valley fever virus surveillance in Western Kenya. One Health 2022; 15:100457. [PMID: 36532672 PMCID: PMC9754961 DOI: 10.1016/j.onehlt.2022.100457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 11/11/2022] [Accepted: 11/12/2022] [Indexed: 11/16/2022] Open
Abstract
Rift Valley fever virus (RVFV) is an economically devastating, zoonotic arbovirus endemic across Africa with potential to cause severe disease in livestock and humans. Viral spread is primarily driven by movement of domestic ruminants and there is a high potential for transboundary spread. Despite influx of livestock to urban areas in response to the high demand for meat and animal products, RVFV has not been detected in any urban center. The objectives of this study were to determine the feasibility of assessing risk of RVFV introduction to urban Kisumu, Kenya, by testing slaughtered livestock for RVFV exposure and mapping livestock origins. Blood was collected from cattle, sheep, and goats directly after slaughter and tested for anti-RVFV IgG antibodies. Slaughterhouse businessmen responded to a questionnaire on their individual animals' origin, marketplace, and transport means. Thereafter, we mapped livestock flow from origin to slaughterhouse using participatory methods in focus group discussions with stakeholders. Qualitative data on route choice and deviations were spatially integrated into the map. A total of 304 blood samples were collected from slaughtered livestock in October and November 2021. Most (99%) of animals were purchased from 28 different markets across eight counties in Western Kenya. The overall RVFV seroprevalence was 9% (19% cattle, 3% in sheep, and 7% in goats). Migori County bordering Tanzania had the highest county-level seroprevalence (34%) and 80% of all seropositive cattle were purchased at the Suba Kuria market in Migori County. Road quality and animal health influenced stakeholders' decisions for choice of transport means. Overall, this proof-of-concept study offers a sampling framework for RVFV that can be locally implemented and rapidly deployed in response to regional risk. This system can be used in conjunction with participatory maps to improve active livestock surveillance and monitoring of RVFV in Western Kenya, and these methods could be extrapolated to other urban centers or livestock diseases.
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Affiliation(s)
- Keli Nicole Gerken
- Department of Pediatrics, Division of Infectious Disease, Stanford University School of Medicine, Stanford, CA, USA,Corresponding author at: LaBeaud Research Lab, Stanford University School of Medicine, Biomedical Innovation BMI Building, 2 Floor, Room 2400, 1291 Welch Road, Stanford, CA -, USA.
| | | | - Kevin Omondi Owuor
- Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya
| | | | - Krish Seetah
- Department of Anthropology, Stanford University, USA
| | - Angelle Desiree LaBeaud
- Department of Pediatrics, Division of Infectious Disease, Stanford University School of Medicine, Stanford, CA, USA
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Waage J, Grace D, Fèvre EM, McDermott J, Lines J, Wieland B, Naylor NR, Hassell JM, Chan K. Changing food systems and infectious disease risks in low-income and middle-income countries. Lancet Planet Health 2022; 6:e760-e768. [PMID: 36087606 PMCID: PMC9451496 DOI: 10.1016/s2542-5196(22)00116-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 04/08/2022] [Accepted: 04/12/2022] [Indexed: 06/15/2023]
Abstract
The emergence of COVID-19 has drawn the attention of health researchers sharply back to the role that food systems can play in generating human disease burden. But emerging pandemic threats are just one dimension of the complex relationship between agriculture and infectious disease, which is evolving rapidly, particularly in low-income and middle-income countries (LMICs) that are undergoing rapid food system transformation. We examine this changing relationship through four current disease issues. The first is that greater investment in irrigation to improve national food security raises risks of vector-borne disease, which we illustrate with the case of malaria and rice in Africa. The second is that the intensification of livestock production in LMICs brings risks of zoonotic diseases like cysticercosis, which need to be managed as consumer demand grows. The third is that the nutritional benefits of increasing supply of fresh vegetables, fruit, and animal-sourced foods in markets in LMICs pose new food-borne disease risks, which might undermine supply. The fourth issue is that the potential human health risks of antimicrobial resistance from agriculture are intensified by changing livestock production. For each disease issue, we explore how food system transition is creating unintentional infectious disease risks, and what solutions might exist for these problems. We show that successfully addressing all of these challenges requires a coordinated approach between public health and agricultural sectors, recognising the costs and benefits of disease-reducing interventions to both, and seeking win-win solutions that are most likely to attract broad policy support and uptake by food systems.
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Affiliation(s)
- Jeff Waage
- Department of Disease Control, London School of Hygiene & Tropical Medicine, London, UK.
| | - Delia Grace
- International Livestock Research Institute, Nairobi, Kenya; Natural Resources Institute, University of Greenwich, London, UK
| | - Eric M Fèvre
- International Livestock Research Institute, Nairobi, Kenya; Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK
| | - John McDermott
- International Food Policy Research Institute, Washington, DC, USA
| | - Jo Lines
- Department of Disease Control, London School of Hygiene & Tropical Medicine, London, UK
| | - Barbara Wieland
- International Livestock Research Institute, Nairobi, Kenya; Institute of Virology and Immunology, Mittelhäusern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Nichola R Naylor
- Department of Disease Control, London School of Hygiene & Tropical Medicine, London, UK
| | - James M Hassell
- International Livestock Research Institute, Nairobi, Kenya; Smithsonian National Zoo and Conservation Biology Institute, Washington, DC, USA
| | - Kallista Chan
- Department of Disease Control, London School of Hygiene & Tropical Medicine, London, UK
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Floyd JR, Kwoba E, Mwangi T, Okotto-Okotto J, Wanza P, Wardrop N, Yu W, Wright JA. A spatiotemporal analysis of cattle herd movement in relation to drinking-water sources: implications for Cryptosporidium control in rural Kenya. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:34314-34324. [PMID: 35038102 PMCID: PMC9076705 DOI: 10.1007/s11356-021-17888-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 11/27/2021] [Indexed: 06/14/2023]
Abstract
Given the increasing evidence that domestic contact with livestock is a risk factor for child diarrhoea in low- and middle-income countries, there have been calls for greater quantification of human-livestock contact in such countries. This study aimed to quantify seasonality in cattle proximity to domestic water sources and household compounds and develop a preliminary landscape model of faecal deposition by cattle. A total of 120 cattle in smallholder herds in the Asembo area of Siaya County, Kenya, were tracked over 1 week in April 2018 to July 2018 and November 2018 to February 2019 using GPS tracking devices. Dung deposition and behaviour were observed among 33 cattle from these herds over 185.4 hours. Mean cattle home ranges were small at 3.78 km2 and 5.85 km2 in the wet and dry seasons, respectively. There were significant differences between seasons in home range size, distance travelled from the household, and time spent tethered, but not in the time spent at domestic water sources or home range overlap with other herds. On average, 0.76 dung deposition events/hour were observed, with higher frequency in bulls. Variation in cattle proximity to household compounds and water sources did not account for seasonal variation in child diarrhoea in this population. The preliminary landscape model of faecal deposition by cattle could be further developed to inform interventions for safe separation of livestock and people, such as fencing and separate water troughs.
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Affiliation(s)
- Jessica R Floyd
- School of Geography and Environmental Science, University of Southampton, Building 44, Highfield, Southampton, SO17 1BJ, UK.
| | - Emmah Kwoba
- Centre for Global Health Research, Kenya Medical Research Institute, P.O. Box 1578-1400, Kisian campus, Kisumu-Busia Highway, Kisumu, Kenya
| | - Thumbi Mwangi
- Centre for Global Health Research, Kenya Medical Research Institute, P.O. Box 1578-1400, Kisian campus, Kisumu-Busia Highway, Kisumu, Kenya
| | - Joseph Okotto-Okotto
- Victoria Institute for Research on Environment and Development (VIRED) International, P.O. Box 6423-40103, off Nairobi Road, Rabuor, Kenya
| | - Peggy Wanza
- Centre for Global Health Research, Kenya Medical Research Institute, P.O. Box 1578-1400, Kisian campus, Kisumu-Busia Highway, Kisumu, Kenya
| | - Nicola Wardrop
- School of Geography and Environmental Science, University of Southampton, Building 44, Highfield, Southampton, SO17 1BJ, UK
| | - Weiyu Yu
- School of Geography and Environmental Science, University of Southampton, Building 44, Highfield, Southampton, SO17 1BJ, UK
| | - Jim A Wright
- School of Geography and Environmental Science, University of Southampton, Building 44, Highfield, Southampton, SO17 1BJ, UK
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Livestock movement informs the risk of disease spread in traditional production systems in East Africa. Sci Rep 2021; 11:16375. [PMID: 34385539 PMCID: PMC8361167 DOI: 10.1038/s41598-021-95706-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 07/01/2021] [Indexed: 11/22/2022] Open
Abstract
In Africa, livestock are important to local and national economies, but their productivity is constrained by infectious diseases. Comprehensive information on livestock movements and contacts is required to devise appropriate disease control strategies; yet, understanding contact risk in systems where herds mix extensively, and where different pathogens can be transmitted at different spatial and temporal scales, remains a major challenge. We deployed Global Positioning System collars on cattle in 52 herds in a traditional agropastoral system in western Serengeti, Tanzania, to understand fine-scale movements and between-herd contacts, and to identify locations of greatest interaction between herds. We examined contact across spatiotemporal scales relevant to different disease transmission scenarios. Daily cattle movements increased with herd size and rainfall. Generally, contact between herds was greatest away from households, during periods with low rainfall and in locations close to dipping points. We demonstrate how movements and contacts affect the risk of disease spread. For example, transmission risk is relatively sensitive to the survival time of different pathogens in the environment, and less sensitive to transmission distance, at least over the range of the spatiotemporal definitions of contacts that we explored. We identify times and locations of greatest disease transmission potential and that could be targeted through tailored control strategies.
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Muinde P, Bettridge JM, Sousa FM, Dürr S, Dohoo IR, Berezowski J, Mutwiri T, Odinga CO, Fèvre EM, Falzon LC. Who let the dogs out? Exploring the spatial ecology of free-roaming domestic dogs in western Kenya. Ecol Evol 2021; 11:4218-4231. [PMID: 33976805 PMCID: PMC8093722 DOI: 10.1002/ece3.7317] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 01/22/2021] [Accepted: 01/26/2021] [Indexed: 11/23/2022] Open
Abstract
The spatial ecology of free-roaming dogs determines their role in the transmission of zoonoses. This study describes the geographic range of and identifies sites frequently visited by free-roaming domestic dogs in western Kenya. Eight sites in Busia county, western Kenya, were selected. At each site, ten dog-keeping households were recruited, a questionnaire was administered, and a GPS logger was fixed around the neck of one dog in each household. Loggers were programmed to capture the dog's position every minute, for five consecutive days. Individual summaries of GPS recordings were produced, and the daily distance traveled was calculated. 50% and 95% utilization distribution isopleths were produced, and the area within these isopleths was extracted to estimate the size of the core and extended Home Ranges (HRs), respectively. Linear regression analyses were performed to identify factors associated with the movement parameters. The centroid points of the 10, 50, and 90% isopleths were reproduced, and the corresponding sites identified on the ground. Seventy-three dogs were included in the final analyses. The median daily distance traveled was 13.5km, while the median core and extended HRs were 0.4 and 9.3 ha, respectively. Older dogs had a larger extended HR and traveled more daily, while the effect of sex on dog movement depended on their neutering status. Dogs spent most of their time at their household; other frequently visited sites included other household compounds, fields, and rubbish dumps. One of the centroids corresponded to a field located across the international Kenya-Uganda border, emphasizing the fluidity across the border in this ecosystem. Multiple dogs visited the same location, highlighting the heterogeneous contact networks between dogs, and between dogs and people. The field data presented are of value both in understanding domestic dog ecology and resource utilization, and in contextualizing infectious and parasitic disease transmission models.
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Affiliation(s)
- Patrick Muinde
- International Livestock Research InstituteNairobiKenya
- Present address:
World Animal ProtectionNairobiKenya
| | - Judy M. Bettridge
- International Livestock Research InstituteNairobiKenya
- Institute of Infection, Veterinary, and Ecological SciencesUniversity of LiverpoolLiverpoolUK
- Present address:
Natural Resources InstituteUniversity of GreenwichChatham MaritimeUK
| | - Filipe M. Sousa
- Veterinary Public Health InstituteUniversity of BernBernSwitzerland
| | - Salome Dürr
- Veterinary Public Health InstituteUniversity of BernBernSwitzerland
| | - Ian R. Dohoo
- Atlantic Veterinary CollegeUniversity of Prince Edward IslandCharlottetownCanada
| | - John Berezowski
- Veterinary Public Health InstituteUniversity of BernBernSwitzerland
| | - Titus Mutwiri
- International Livestock Research InstituteNairobiKenya
- Jomo Kenyatta University of Agriculture and TechnologyNairobiKenya
| | | | - Eric M. Fèvre
- International Livestock Research InstituteNairobiKenya
- Institute of Infection, Veterinary, and Ecological SciencesUniversity of LiverpoolLiverpoolUK
| | - Laura C. Falzon
- International Livestock Research InstituteNairobiKenya
- Institute of Infection, Veterinary, and Ecological SciencesUniversity of LiverpoolLiverpoolUK
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Floyd JR, Ogola J, Fèvre EM, Wardrop N, Tatem AJ, Ruktanonchai NW. Activity-specific mobility of adults in a rural region of western Kenya. PeerJ 2020; 8:e8798. [PMID: 32377444 PMCID: PMC7195828 DOI: 10.7717/peerj.8798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 02/25/2020] [Indexed: 11/25/2022] Open
Abstract
Improving rural household access to resources such as markets, schools and healthcare can help alleviate poverty in low-income settings. Current models of geographic accessibility to various resources rarely take individual variation into account due to a lack of appropriate data, yet understanding mobility at an individual level is key to knowing how people access their local resources. Our study used both an activity-specific survey and GPS trackers to evaluate how adults in a rural area of western Kenya accessed local resources. We calculated the travel time and time spent at six different types of resource and compared the GPS and survey data to see how well they matched. We found links between several demographic characteristics and the time spent at different resources, and that the GPS data reflected the survey data well for time spent at some types of resource, but poorly for others. We conclude that demography and activity are important drivers of mobility, and a better understanding of individual variation in mobility could be obtained through the use of GPS trackers on a wider scale.
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Affiliation(s)
- Jessica R Floyd
- WorldPop, Department of Geography and Environmental Science, University of Southampton, Southampton, United Kingdom
| | - Joseph Ogola
- International Livestock Research Institute, Nairobi, Kenya
| | - Eric M Fèvre
- International Livestock Research Institute, Nairobi, Kenya.,Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
| | - Nicola Wardrop
- Department for International Development, Glasgow, United Kingdom
| | - Andrew J Tatem
- WorldPop, Department of Geography and Environmental Science, University of Southampton, Southampton, United Kingdom
| | - Nick W Ruktanonchai
- WorldPop, Department of Geography and Environmental Science, University of Southampton, Southampton, United Kingdom
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