Section Publications

Grewar, J.D., Kotze, J.L, Parker, B.J., van Helden, L.S. & Weyer, C.T., 2021, An entry risk assessment of African horse sickness virus into the controlled area of South Africa through the legal movement of equids. PLoS ONE, 16(5): e0252117
Roberts, L.C., van Helden, L.S., Fox, C.A., Fiff, F. & Visser, D.J., 2020, Provincial Veterinary Services respond to drought in South Africa. Scientific and Technical Review, 39 (2)
van Helden, L., van Helden, P.D. & Meiring, C., 2020, Pathogens of vertebrate animals as invasive species: insights from South Africa. In: van Wilgen B., Measey J., Richardson D., Wilson J., Zengeya T. (eds) Biological Invasions in South Africa. Invading Nature - Springer Series in Invasion Ecology, vol 14. Springer, Cham
Valley-Omar, Z., Cloete, A., Pieterse, R., Walaza, S., Salie-Bassier, Y., Smith, M., Govender, N., Seleka, M., Hellferscee, O., Mtshali, P.S., Allam, M., Ismail, A., Anthony, T., Seutloali, M., McCarthy, K., van Helden, L.S., Cohen, C. and Treurnicht, F.K. 2020, Human surveillance and phylogeny of highly pathogenic avian influenza A(H5N8) during an outbreak in poultry in South Africa, 2017, Influenza and Other Respiratory Viruses
Grewar, J.D., Sergeant, E.S., Weyer, C.T., van Helden L.S., Parker, B.J., Anthony, T. & Thompson, P.N., 2019, Establishing post outbreak freedom from African horse sickness virus in South Africa's surveillance zone, Transboundary and Emerging Diseases, 66(6)
Grewar, J.D., Weyer, C.T., Venter, G.J., van Helden L.S., Burger, P., Guthrie, A.J., Coetzee, P., Labuschagne, K., Buhrmann, G., Parker, B.J. & Thompson, P.N., 2018, A field investigation of an African horse sickness outbreak in the controlled area of South Africa in 2016, Transboundary and Emerging Diseases, 66(2)
Miller, M.A., Davey, S.C., van Helden L.S., Kettner, F., Weltan, S.M., Last, R., Grewar, J.D., Botha, L. & van Helden, P.D., 2017, Paratuberculosis in a domestic dog in South Africa, Journal of the South African Veterinary Association, 88
Weyer, C., Grewar, J.D., Burger, P., Rossouw, E., Lourens, C., Joone, C., le Grange, M., Coetzee, P., Venter, E.H., Martin, D.P., MacLachlan, J. & Guthrie, A.J., 2016, African horse sickness caused by genome reassortment and reversion to virulence of live, attenuated vaccine viruses, South Africa, 2004 to 2014, Emerging Infectious Diseases, 22(12)
Grewar, J.D., 2016, The economic impact of bluetongue and other orbiviruses in sub-Saharan Africa, with special reference to Southern Africa, Veterinaria Italiana, 52(3-4)
van Helden, L.S., Sinclair, M., Koen, P. & Grewar, J.D., 2016, Description of an outbreak of highly pathogenic avian influenza in domestic ostriches (Struthio camelus) in South Africa in 2011, Preventive Veterinary Medicine, 128
de Vos, A., Cumming, G.S., Cumming, D.H.M., Ament, J.M., Baum, J., Clements, H.S., Grewar, J.D., Maciejewski, K. & Moore, C., 2016, Pathogens, disease, and the social-ecological resilience of protected areas, Ecology and Society, 21(1)
Sergeant, E.S., Grewar, J.D., Weyer, C.T. & Guthrie, A.J.,2016, Quantitative risk assessment for African horse sickness in live horses exported from South Africa, PLoS ONE
Hammond-Aryee, K., Esser, M., van Helden, L. & van Helden, P., 2015, A high seroprevalence of Toxoplasma gondii antibodies in a population of feral cats in the Western Cape province of South Africa, Southern African Journal of Infectious Diseases, 30(4)
Hammond-Aryee, K., van Helden, L. & van Helden, P., 2015, The prevalence of antibodies to Toxoplasma gondii in sheep in the Western Cape, South Africa, Onderstepoort Journal of Veterinary Research, 82(1)
Grewar, J.D., Thompson, P.N., Lourens, C.W. & Guthrie, A.J., 2015, Equine encephalosis in Thoroughbred foals on a South African stud farm, Onderstepoort Journal of Veterinary Research, 82(1)
Moore, C., Grewar, J. & Cumming, G.S., 2015, Quantifying network resilience: comparison before and after a major perturbation shows strengths and limitations of network metrics, Journal of Applied Ecology, 53
Weyer, C.T., Joone, C., Lourens, C.W., Monyai, M.S., Koekemoer, O., Grewar, J.D., van Schalkwyk, A., Majiwa, P.O., MacLachlan, N.J. & Guthrie, A.J., 2015, Development of three triplex real-time reverse transcription PCR assays for the qualitative molecular typing of the nine serotypes of African horse sickness virus, Journal of Virological Methods, 223
Cumming, G.S., Abolnik, C., Caron, A., Gaidet, N., Grewar, J., Hellard, E., Henry, D.A.W. & Reynolds, C., 2015, A social–ecological approach to landscape epidemiology: geographic variation and avian influenza, Landscape Ecology, 30(6)
McReynolds, S.W., Sanderson, M.W., Reeves, A., Sinclair, M., Hill, A.E. & Salman, M.D., 2014, Direct and indirect contact rates among livestock operations in Colorado and Kansas, Journal of the American Veterinary Medical Association, 244(9)
Moore, C., Cumming, G.S., Slingsby, J. & Grewar, J., 2014, Tracking socioeconomic vulnerability using network analysis: insights from an avian influenza outbreak in an ostrich production network, PLoS ONE, 9(1)
Grewar, J.D., Weyer, C.T., Guthrie, A.J., Koen, P., Davey, S., Quan, M., Visser, D, Russouw, E. & Buhrmann, G., 2013, The 2011 outbreak of African horse sickness in the African horse sickness controlled area in South Africa, Journal of the South African Veterinary Association, 84(1)
van Helden, P.D., van Helden, L.S. & Hoal, E.G., 2013, One world, one health, EMBO Reports, 14
Abolnik, C., Olivier, A.J., Grewar, J., Gers, S. & Romito, M., 2012, Molecular analysis of the 2011 HPAI H5N2 outbreak in ostriches, South Africa, Avian Diseases, 56
Aolnik, C., Gerdes, G.H., Sinclair, M., Ganzevoort, B.W., Kitching, J.P., Burger, C.E., Romito, M., Dreyer, M., Swanepoel, S., Cumming, G.S. & Olivier, A.J., 2010, Phylogenetic analysis of influenza A viruses (H6N8, H1N8, H4N2, H9N2, H10N7) isolated from wild birds, ducks, and ostriches in South Africa from 2007 to 2009, Avian Diseases, 54(1 Suppl)
Paton, D.J., Sinclair, M. & Rodriguez, R., 2009, Qualitative assessment of the commodity risk for spread of foot-and-mouth disease associated with international trade in deboned beef
Grewar, J.D., Allen, J.G. & Guthrie, A.J., 2009, Annual ryegrass toxicity in Thoroughbred horses in Ceres in the Western Cape Province, South Africa, Journal of the South African Veterinary Association, 80(4)
Thompson, P.N., Sinclair, M. & Ganzevoort, B., 2008, Risk factors for seropositivity to H5 avian influenza virus in ostrich farms in the Western Cape Province, South Africa, Preventive Veterinary Medicine, 86(1-2)
Sinclair, M., Buhrmann, G. & Gummow, B., 2006, An epidemiological investigation of the African horsesickness outbreak in the Western Cape Province of South Africa in 2004 and its relevance to the current equine export protocol, Journal of the South African Veterinary Association, 77(4)
Sinclair, M., Bruckner, G.K. & Kotze, J.J., 2006, Avian influenza in ostriches: epidemiological investigation in the Western Cape Province of South Africa, Veterinarian Italiana, 42(2)