Prof Wim Delva, PhD

Research Associate

Research theme: Research Associate

Wim is a medical doctor and epidemiologist, he has joint research appointment at the International Centre for Reproductive Health at Ghent University in Belgium, and the South African Centre for Epidemiological Modelling and Analysis at the University of Stellenbosch, South Africa. He is passionate about applied statistics and epidemiology related to the HIV epidemics in sub-Saharan Africa.

Recent publications

Niyukuri D, Chibawara T, Nyasulu PS, Delva W (2021) Inferring HIV Transmission Network Determinants Using Agent-Based Models Calibrated to Multi-Data Sources Mathematics doi.org/10.3390/ math9212645

Hendrickx DM, Delva W, Hens N (2021) Influence of sexual risk behaviour and STI co-infection dynamics on the evolution of HIV set point viral load in MSM Epidemics doi.org/10.1016/j.epidem.2021.100474

Delva W, Dominic EM, Beauclair R, Ouifki R, Kroon M, Volmink H, Dorkin E (2021) Four-week forecasts of COVID-19 epidemic trajectories in South Africa, Chile, Peru and Brazil: a model evaluation doi.org/10.1101/2021.09.06.21263151

Hendrickx DM, Sousa JD, Libin PJK, Delva W, Liesenborgs J, Hens N, Müller V, Vandamme A (2021) Comparison of two simulators for individual based models in HIV epidemiology in a population with HSV 2 in Yaoundé (Cameroon) Scientific Reports doi.org/10.1038/s41598-021-94289-z

Niyukuri D, Nyasulu P, Delva W (2021) Assessing the uncertainty around age-mixing patterns in HIV transmission inferred from phylogenetic trees PLOS One doi.org/10.1371/journal.pone.0249013

Khan, S., S. Donna, F. Walsh, S. Mazibuko, M. Pasipamire, B. Chai, R. Reis, K. Mlambo, W. Delva, G Khumalo, M. Zwane, Y. Fleming, E. Mafara, A. Hettema, C Lejeune, A. Chao, T. Bänighausen, & V. Okello (2020) Early access to antiretroviral therapy versus standard of care among HIV-positive participants in Eswatini in the public health sector: the MaxART stepped-wedge randomized controlled trial. Journal of the International AIDS Society 23(9): e25610 doi: 10.1002/jia2.25610

Chao, A., D. Spiegelman, S. Khan, F. Walsh, S. Mazibuko, M. Pasipamire, B. Chai, R. Reis, K. Mlambo, W. Delva, G. Khumalo, M. Zwane, Y. Fleming, E. Mafara, A. Hettema, C. Lejeune, T. Bärnighausen, & V. Okello (2020) Mortality under early access to antiretroviral therapy vs. Eswatini’s national standard of care: the MaxART clustered randomized steppedwedge trial. HIV Medicine 21:429-440 doi: 10.1111/hiv.12876

Hazelbag, C.M., J. Dushoff, E.M. Dominic, Z.E. Mthombothi, & W. Delva (2020) Calibration of individual-based models to epidemiological data: A systematic review. PLOS Computational Biology 16(5):e1007893 doi:10.1371/journal.pcbi.1007893

Liesenborgs, J., D.M. Hendrickx, E. Kuylen, D. Niyukuri, N. Hens, & W. Delva (2019) SimpactCyan 1.0: An Open-source Simulator for Individual-Based Models in HIV Epidemiology with R and Python Interfaces. Scientific Reports 9, 19289 doi: 10.1038/s41598-019-55689-4

Verelst, F., W. Delva, P. Beutels, & L. Willem (2019) Drivers of vaccine decision-making in South Africa: A discrete choice experiment. Vaccine 37(15):2079-2089 doi: 10.1016/j.vaccine.2019.02.056

Kenyon, C.R., and Delva W. (2019) It is the network, stupid: a populations sexual network connectivity determines its STI prevalence. F1000 Research 7: 1880. doi: 10.12688/f1000research.17148.2

Kenyon, C.R., W. Delva, & R.M. Brotman (2019) Differential sexual network connectivity offers a parsimonious explanation for population-level variations in the prevalence of bacterial vaginosis: a data-driven, model-supported hypothesis. BMC Women's Health 19: 8. doi: 10.1186/s12905-018-0703-0

Beauclair,. R.N., N. Hens, & W. Delva (2018) The role of age-mixing patterns in HIV transmission dynamics: novel hypotheses from a field study in Cape Town, South Africa. Epidemics 25: 61-71. doi: 10.1016/j.epidem.2018.05.006

Lafort, Y., M.S. Ismael de Melo, F. Lessitala, S. Griffin, M. Chersich, & W. Delva (2018) Feasibility, acceptability and potential sustainability of a 'diagonal' approach to health services for female sex workers in Mozambique. BMC Health Services Research 18:752 doi: 10.1186/s12913-018-3555-2

Lafort, Y., L. Greener, F. Lessitala, S. Chabeda, R. Greener, M. Beksinska, M. Gichangi, S. Griffin, J.A. Smit, M. Chersich, & W. Delva. (2018) Effect of a diagonal intervention on uptake of HIV and reproductive health services by female sex workers in three sub-Saharan African cities. Tropical Medicine and International Health 23(7):774-784. doi: 10.1111/tmi.13072

Lafort. Y., F. Lessitala, M.S.I. De Melo, S. Griffin, M. Chersich, & W. Delva (2018) Impact of a "Diagonal" Intervention on Uptake of Sexual and Reproductive Health Services by Female Sex Workers in Mozambique: A Mixed-Methods Implementation Study. Frontiers in Public Health 6: 109. doi: 10.3389/fpubh.2018.00109

Beauclair, R., J.Dushoff, & W.Delva. (2018) Partner age differences and associated sexual risk behaviours among adolescent girls and young women in a cash transfer programme for schooling in Malawi. BMC Public Health 18(403);12. doi: 10.1186/s12889-018-5327-7

Walsh, F.J., T. Barnighausen , W. Delva, Y. Fleming, G. Khumalo, C.L. Lejeune, S. Mazibuko, C.K. Mlambo, R. Reis, D. Spiegelman, M. Zwane, & V. Okello. (2017) Impact of early initiation versus national standard of care of antiretroviral therapy in Swaziland's public sector health system: study protocol for stepped-wedge randomized trial. Trials 18(1):383. doi: 10.1186/s13063-017-2128-8

Lafort, Y., R. Greener, A. Roy, L. Greener, W. Ombidi, F. Lessitala, J. Skordis-Worrall, M. Beksinska, P. Gichangi, S. Reza-Paul, J.A. Smit, M. Chersich & W. Delva (2017) Sexual and reproductive health services utilization by female sex workers is contextspecific: results from a cross-sectional survey in India, Kenya, Mozambique and South Africa. Reproductive Health 14:13. doi: 10.1186/s12978-017-0277-6

Delva, W. (2017) The transcontinental scientist. Science 355(6322):318. doi: 10.1126/science.355.6322.318

Lafort, Y., O. Jocitala, B. Candrinho, L. Greener, M. Beksinska, J.A. Smit, M. Chersich, & W. Delva (2016) Are HIV and reproductive health services adapted to the needs of female sex workers? Results of a policy and situational analysis in Tete, Mozambique. BMC Health Services Research 16:301. doi: 10.1186/s12913-016-1551-y

Beauclair, R., S. Helleringer, N. Hens, & W. Delva (2016) Age differences between sexual partners, behavioural and demographic correlates, and HIV infection on Likoma Island, Malawi. SCIENTIFIC REPORTS 6:36121. doi: 10.1038/srep36121

Lafort, Y., R. Greener, A. Roy, L. Greener, W. Ombidi, F. Lessitala, H. Haghparast-Bidgoli, M. Beksinska, P. Gichangi, S. Reza-Paul, J.A. Smit, M. Chersich, & W. Delva (2016) HIV prevention and care seeking behaviour among female sex workers in four cities in India, Kenya, Mozambique and South Africa. Tropical Medicine and International Health 21(10):1293-1303. doi: 10.1111/tmi.12761

Delva, W. & S. Helleringer (2016) Beyond risk compensation: Clusters of Antiretroviral Treatment (ART) users in sexual networks can modify the impact of ART on HIV incidence. PLOS ONE 11(9):e0163159. doi: 10.1371/journal. pone.0163159

Delva, W., G.E. Leventhal, & S. Helleringer (2016) Connecting the dots: network data and models in HIV epidemiology. AIDS: An official International AIDS Society Journal 30(13):2009-2020. doi: 10.1097/QAD.0000000000001184

Lafort, Y., R. Greener, A. Roy, L. Greener, W. Ombidi, F. Lessitala, H. Haghparast-Bidgoli, M. Beksinska, P. Gichangi, S. Reza-Paul, J.A. Smit, M. Chersich, & W. Delva (2016) Where Do Female Sex Workers Seek HIV and Reproductive Health Care and What Motivates These Choices? A Survey in 4 Cities in India, Kenya, Mozambique and South Africa. PLOS ONE 11(8):e0160730. doi: 10.1371/journal.pone.0160730

Lafort, Y., F. Lessitala, B. Candrinho, L. Greener, R. Greener, M. Beksinska, J.A. Smit, M. Chersich and W. Delva (2016) Barriers to HIV and sexual and reproductive health care for female sex workers in Tete, Mozambique: results from a cross-sectional survey and focus group discussions. BMC Public Health 16:608. doi: 10.1186/s12889-016-3305-5.

Champredon, D., S.E. Bellan, W.Delva, S.Hunt, S. Chyun-Fung, M.Smieja, & J.Dushoff. (2015) The effect of sexually transmitted co-infections on HIV viral load amongst individuals on antiretroviral therapy: a systematic review and meta-analysis BMC Infectious Diseases 15:249. doi: 10.1186/s12879-015-0961-5.

Roxanne Beauclair, Niel Hens, Wim Delva. (2015) Concurrent partnerships in Cape Town, South Africa: race and sex differences in prevalence and duration of overlap. Journal of the International AIDS Society,18:19372. doi: 10.7448/IAS.18.1.19372

Delva W, Abdool Karim Q. (2014) The HIV epidemic in Southern Africa - Is an AIDS-free generation possible? Current HIV/AIDS Reports 11(2). doi: 10.1007/s11904-014-0205-0.

Forgus S, Delva W, Hauptfleisch C, Govender S, Blitz J. (2014) Community v. non-community assault among adults in Khayelitsha, Western Cape, South Africa: a case count and comparison of injury severity. South African Medical Journal 104(4). PMID: 25118558.

Beauclair R, Delva W. (2013) Is younger really safer? A qualitative study of perceived risks and benefits of age-disparate relationships among women in Cape Town, South Africa. PLoS One. 8(11). doi: 10.1371/journal.pone.0081748.

Wim Delva, Yvette Fleming, and Lois Chingandu (2013) When to start ART in Africa ? primarily guided by RCTs or patient autonomy? Journal of The International AIDS Society 16(1). doi: 10.7448/IAS.16.1.18756.

Delva W, Meng F, Beauclair R, Deprez N, Temmerman M, Welte A, Hens N. (2013) Coital frequency and condom use in monogamous and concurrent sexual relationships in Cape Town, South Africa. J Int AIDS Soc. 2013 Apr 24;16:18034. doi: 10.7448/IAS.16.1.18034.

Roxanne Beauclair, Fei Meng, Nele Deprez, Marleen Temmerman, Alex Welte, Niel Hens and Wim Delva (2013) Evaluating audio computer assisted self-interviews in urban south African communities: evidence for good suitability and reduced social desirability bias of a cross-sectional survey on sexual behaviour. BMC Medical Research Methodology 13(11). DOI: 10.1186/1471-2288-13-11.

Guy Severin Mahiane , Rachid Ouifki, Hilmarie Brand, Wim Delva, Alex Welte. (2012) A General HIV Incidence Inference Scheme Based on Likelihood of Individual Level Data and a Population Renewal Equation. PLoS One. 7(9): e44377. doi:10.1371/journal.pone.0044377.

Kristien Michielsen , Roxanne Beauclair, Wim Delva, Kristien Roelens, Ronan Van Rossem and Marleen Temmerman. (2012) Effectiveness of a peer-led HIV prevention intervention in secondary schools in Rwanda: results from a non-randomized controlled trial. BMC Public Health 12. DOI: 10.1186/1471-2458-12-729.

Gerritsen A. A, Mitchell J. S, Johnson S. M, Delva W. (2012) Challenges with using estimates when calculating ART need among adults in South Africa. South African Medical Journal 102(10). doi: 10.7196/samj.5946.

Delva W, Wilson D. P, Abu-Raddad L, Gorgens M, Wilson D, Hallett T. B, Welte A. (2012) HIV treatment as prevention: principles of good HIV epidemiology modelling for public health decision-making in all modes of prevention and evaluation. PLoS Medicin 9(7). doi: 10.1371/journal.pmed.1001239.

Delva W, Eaton J. W, Meng F, Fraser C, White R. G, Vickerman P, Boily M. C, Hallett T. B. (2012) HIV treatment as prevention: optimising the impact of expanded HIV treatment programmes. PLoS Medicine 9(7). doi: 10.1371/journal.pmed.1001258.

Beauclair R, Kassanjee R, Temmerman M, Welte A, Delva W. (2012) Age-disparate relationships and implications for STI transmission among young adults in Cape Town, South Africa. The European Journal Of Contraception and Reproductive Health Care 17(1). doi: 10.3109/13625187.2011.644841.

Wim Delva, Marlise Richter, Petra De Koker, Matthew Chersich, and Marleen Temmerman. (2011) Sex Work during the 2010 FIFA World Cup: Results from a Three-Wave Cross-Sectional Survey. PLoS One 6(12). doi: 10.1371/journal.pone.0028363.

Wim Delva, Roxanne Beauclair, Alex Welte, Stijn Vansteelandt, Niel Hens, Marc Aerts, Elizabeth du Toit, Nulda Beyers and Marleen Temmerman. (2011) Age-disparity, sexual connectedness and HIV infection in disadvantaged communities around Cape Town, South Africa: a study protocol. BMC Public Health 11. DOI: 10.1186/1471-2458-11-616.

Delva W, Verguet S, Hargrove J, Williams B, Sheneberger R, Stander T, Welte A. (2011) Treatment-centred prevention: an integrated biomedical and social approach to HIV prevention. AIDS 25(11). doi: 10.1097/QAD.0b013e3283488503.

Williams B. G, Wood R, Dukay V, Delva W, Ginsburg D, Hargrove J, Stander M, Sheneberger R, Montaner J, Welte A. (2011) Treatment as prevention: preparing the way. Journal of the International Aids Society 14(1). doi: 10.1186/1758-2652-14-S1-S6.

Alex Welte, John Hargrove, Wim Delva, Brian Williams, Tienie Stander (2011) How different are the costs and consequences of delayed versus immediate HIV treatment? South African Medical Journal 101(6).

Desimpel A, Roelens K, Temmerman M, Delva W, De Boeck F, Goethals J and Maes L. (2010) Advies- en hulpvragen van jongeren in verband met seksualiteit. Tijdschrift Jeugdgezondheidszorg 42(2).

Delva W., Michielsen K, Meulders B, Groeninck S, Wasonga E, Ajwang P, Temmerman M, Vanreusel B. (2010) HIV prevention through sport: the case of the Mathare Youth Sport Association in Kenya. AIDS Care 22(8).

Petra De Koker, Pierre Lefèvre, Francine Matthys, Patrick van der Stuyft, Wim Delva (2010) Barriers to VCT despite 13 years of community-based awareness campaigns in a peri-urban township in northern Limpopo. South African Medical Journal 100(6). doi:10.7196/SAMJ.3941.

Wim Delva, Elodie Yard, Stanley Lüchters, Matthew Chersich, Esther Muigai, Vicky Oyier and Marleen Temmerman (2010) A safe motherhood project in Kenya assessment of antenatal attendance, service provision and implications for PMTCT. Trop. Med. Int. Health 15(5). doi: 10.1111/j.1365-3156.2010.02499.x

Yves Lafort, Diederike Geelhoed, Luisa Cumba, Carla das Dores Mosse L?zaro, Wim Delva, Stanley Luchters and Marleen Temmerman. (2010) Reproductive health services for populations at high risk of HIV: Performance of a night clinic in Tete province, Mozambique. BMC Health Services Research 10(144). DOI: 10.1186/1472-6963-10-144.

Stanley MF Luchters, Davy Vanden Broeck, Matthew F Chersich, Annalene Nel, Wim Delva, Kishor Mandaliya, Christophe E Depuydt, Patricia Claeys, John-Paul Bogers, Marleen Temmerman (2010) Association of HIV infection with distribution and viral load of HPV types in Kenya a survey with 820 female sex workers. Luchters et al. BMC Infectious Diseases 10(18). doi:10.1186/1471-2334-10-18.

Delva W, Vercoutere A, Loua C, Lamah J, Vansteelandt S, De Koker P, Claeys P, Temmerman and Annemans L (2009) Psychological Well-Being And Socio-Economic Hardship Among Aids Orphans And Other Vulnerable Children In Guinea. AIDS Care-Psychological And Socio-Medical Aspects Of AIDS/HIV 21(12). doi: 10.1080/09540120902887235.

Wim Delva, Carel Pretorius, Marleen Temmerman (2009) Is scaling up enough to curb the HIV epidemic in southern Africa? South African Medical Journal 99(9).

DSI-NRF Centre of Excellence in Epidemiological Modelling and Analysis