Trypanosomiasis: alleviating the effects of climate change through understanding human-vector-parasite interactions

Trypanosomiasis: alleviating the effects of climate change through understanding human-vector-parasite interactions

Why this project?

Climate change may increase tsetse fly efficacy and distribution, while agricultural encroachment to more remote areas may increase the contact of vulnerable populations with tsetse-transmitted trypanosomes. This could potentially result in increased health vulnerability.

The aim

To assess risks of trypanosomiasis infection for marginalised communities in Tanzania, to monitor trypanosomiasis in livestock in marginalised communities in Zimbabwe and to find ways of alleviating infection risks in both countries.

The sites

  • Zimbabwe: Zambezi Valley
  • Tanzania: western side of the Serengeti National Park

Objectives

Objective 1

Assessment of estimated and perceived risks of trypanosome infection, in the light of possible climate change, for marginalised communities in Tanzania

Objective 2

Monitoring the incidence of human-infective trypanosomiasis in livestock in, and close to, marginalised communities in Zimbabwe

Objective 3

Assessment of the future risk of trypanosomiasis infection in Zimbabwe and Tanzania and ways of alleviating that risk

Research approaches

  • Questionnaires, interviews and focus group discussions
  • A variety of entomological techniques for indoor and outdoor vector research

  • Data collection on T. brucei infections in cattle

  • Experiments to measure man-fly contact under different meteorological conditions

  • Climate-driven modeling of vector dynamics

Publications

Auty H, Morrison L, Torr SJ, Lord JS (2016) Transmission Dynamics of Rhodesian Sleeping Sickness at the Interface of Wildlife and Livestock Areas. Trends in Parasitology, 32(8): 608-621. Available from https://www.ncbi.nlm.nih.gov/pubmed/27262917

Barclay HJ, Hargrove JW, van den Driessche P (2019) Estimating tsetse fertility: daily averaging versus periodic larviposition. Med Vet Entomolhttps://doi.org/10.1111/mve.12399

Byamungu M, Hargrove J, Nkwengulila G, Matembo S (2017) Evaluation of trapping devices for tsetse flies (Glossina spp) in western Serengeti. Imperial Journal of Interdisciplinary Research 3, 951-955.

Byamungu M, Nkwengulila G, Matembo S (2016) Evaluation of knowledge, attitude and practices of agro-pastoralists on tsetse fly (Glossina sp.) in Western Serengeti Tanzania. Journal of Veterinary Medicine and Animal Health 8, 169-175.

Cunningham LJ, Lingley JK, Haines LR, Ndung’u JM, Torr SJ, Adams ER (2016) Illuminating the prevalence of Trypanosoma brucei s.l. in Glossina using LAMP as a tool for Xenomonitoring. PLoS Neglected Tropical Diseases, 10(2): https://doi.org/10.1371/journal.pntd.0004441

English S, Cowen H, Garnett E, Hargrove JW (2016) Maternal effects on offspring in a natural population of the viviparous tsetse fly. Ecological Entomology. Available from https://resjournals.onlinelibrary.wiley.com/doi/abs/10.1111/een.12333

Hargrove JW, Ackley SF (2015) Mortality estimates from ovarian age distributions of the tsetse fly Glossina pallidipes Austen sampled in Zimbabwe suggest the need for new analytical approaches. Bulletin of Entomological Research 105, 294-304. Available from https://www.cambridge.org/core/journals/bulletin-of-entomological-research/article/abs/mortality-estimates-from-ovarian-age-distributions-of-the-tsetse-fly-glossina-pallidipes-austen-sampled-in-zimbabwe-suggest-the-need-for-new-analytical-approaches/7B0B537A6E120F5543795B28E9148A5A

Hargrove J, English S, Torr SJ, Lord J, Haines LR, van Schalkwyk C, Patterson J, Vale G (2019) Wing length and host location in tsetse (Glossina spp): Implications for control using stationary baits. Parasit Vectors. 12(1):24.

Hargrove JW, Vale GA (2019) Models for the rates of pupal development, fat consumption and mortality in tsetse (Glossina spp). Bull Entomol Res. 13:1-13.

Hargrove JW, Muzari MO (2015) Artificial warthog burrows used to sample adult and immature tsetse (Glossina spp) in the Zambezi Valley of Zimbabwe. PLoS Neglected Tropical Diseases 9(3): e0003565. https://doi.org/10.1371/journal.pntd.0003565

Hargrove JW, Muzari MO (2015) Nutritional levels of pregnant and postpartum setse (G. pallidipes Austen) captured in artificial warthog burrows in the Zambezi Valley of Zimbabwe. Physiological Entomology 40, 138-148. Available from https://onlinelibrary.wiley.com/doi/abs/10.1111/phen.12098

Kajunguri D, Are EB, Hargrove JW (2019) Improved estimates for extinction probabilities and times to extinction for populations of tsetse (Glossina spp). PLoS Negl Trop Dis. 13(4).

Kajunguri D, Hargrove JW, Ouifki R, Mugisha JYT, Coleman PG, Welburn SC (2014) Modelling the use of insecticide-treated cattle to control tsetse and Trypanosoma brucei rhodesiense in a multi-host population. Bulletin of Mathematical Biology 76, 673-96. doi: 10.1007/s11538-014-9938-6. Available from https://link.springer.com/article/10.1007/s11538-014-9938-6

Kovacic V, Tirados I, Esterhuizen J, Mangwiro CTN, Lehane MJ, Torr SJ, Smith H (2016) We remember… Elders’ memories and perceptions of sleeping sickness control interventions in West Nile, Uganda. PLOS Neglected Tropical Diseases.

Njoroge MM, Tirados I, Lindsay SW, Vale GA, Torr SJ, Fillinger U (2017) Exploring the potential for using cattle for malaria vector surveillance and control: a pilot study in Kenya. Parasites & Vectors,10:18. https://doi.org/10.1186/s13071-016-1957-8

Shaw APM, Tirados I, Mangwiro CTN, Esterhuizen J, Lehane MJ, Torr SJ, Kovacic V (2015) Costs of using “Tiny Targets” to control Glossina fuscipes fuscipes, a vector of Gambiense sleeping sickness in Arua District of Uganda. PLoS Neglected Tropical Diseases 9(3): e0003624. https://doi.org/10.1371/journal.pntd.0003624

Tirados I, Esterhuizen J, Kovacic V, Mangwiro CTN, Vale GA, Hastings I, Solano P, Lehane MJ, Torr SJ (2015) Tsetse control and Gambian sleeping sickness: implications for control strategy. PLoS Neglected Tropical Diseases 9(8): e0003822. https://doi.org/10.1371/journal.pntd.0003822

Torr SJ, Vale GA (2015) Know your foe: lessons from the analysis of tsetse fly behaviour. Trends in Parasitology 31, 95-99. Available from https://www.sciencedirect.com/science/article/abs/pii/S1471492214002232

Vale G, Hargrove J (2015) Predicting the effect of climate change on the abundance and distribution of tsetse flies. SACEMA Quarterly. Published on November 30, 2015.

Vale GA, Hargrove JW, Chamisa A, Grant IF, Torr SJ (2015) Pyrethroid treatment of cattle for tsetse control: reducing its impact on dung fauna. PLoS Neglected Tropical Diseases 9(2):e0003560. https://doi.org/10.1371/journal.pntd.0003560

Vale GA, Hargrove JW, Cullis NA, Chamisa A, Torr SJ (2015) Efficacy of electrocuting devices to catch tsetse flies (Glossinidae) and other Diptera. PLoS Neglected Tropical Diseases9(10):e0004169. https://doi.org/10.1371/journal.pntd.0004169

Vale GA, Hargrove JW, Lehane MJ, Solano P, Torr SJ (2015) Optimal strategies for controlling riverine tsetse flies using targets: a modelling study. PLoS Neglected Tropical Diseaseshttps://doi.org/10.1371/journal.pntd.0003615

Vale GA, Hargrove JW, Solano P, Courtin F, Rayaisse J-B, Lehane MJ, Esterhuizen J, Tirados I, Torr SJ (2014). Explaining the host-finding behaviour of blood-sucking insects: computerized simulation of the effects of habitat geometry on tsetse fly movement. PLoS Neglected Tropical Diseases 8(6): e2901. https://doi.org/10.1371/journal.pntd.0002901

Vale GA, Torr SJ (2015) Surveillance and sampling of disease vectors. Revue Scientifique et Technique (International Office of Epizootics) 34, 227-233.

Reports

van Aardenne L, Wolski P, and Jack C (2017). Rekomitjie Climate Variability and Change: Final Scientific Report. Cape Town. Download PDF

van Aardenne L, Wolski P, and Jack C (2017). Serengeti Climate Variability and Change: Final Scientific Report. Cape Town. Download PDF

Policy Briefs

Trypanosomiasis in Tanzania Download PDF

Trypanosomiasis in Zimbabwe Download PDF

Additional Resources

Mwaseba, D (2017). Reinvesting in dipping facilities is key to controlling Africa Animal Trypanosomiasis in local communities near Serengeti National Park in Tanzania. Download PDF

Partners

The Climate System Analysis Group (CSAG), University of Cape Town (UCT)

Cape Town, South Africa

http://www.csag.uct.ac.za/

South African Centre for Epidemiological Modelling and Analysis (SACEMA)

Stellenbosch, South Africa

http://www.sacema.com/

Tsetse Control Division (TCD), Government of Zimbabwe

Harare, Zimbabwe

Bindura University of Science Education (BUSE)

Bindura, Zimbabwe

http://www.buse.ac.zw/

Sokoine University of Agriculture (SUA)

Morogoro, Tanzania

http://www.suanet.ac.tz/

Vector & Vector-Borne Diseases Research Institute (VVBDI)

Unit of the Ministry of Livestock and Fisheries Development

Liverpool School of Tropical Medicine (LSTM)

Liverpool, England

http://www.lstmed.ac.uk/

Contact

Prof. John Hargrove, SACEMA

jhargrove@sun.ac.za