[1] Uganda Virus Res Inst, 51-59 Nakiwogo Rd,POB 49, Entebbe, Uganda
[2] Makerere Univ, Dept Paediat & Child Hlth, Coll Hlth Sci, POB 7072, Kampala, Uganda
[3] Makerere Univ, Dept Microbiol, Coll Vet Med & Biosecur, POB 7072, Kampala, Uganda
[4] Univ Cambridge, Dept Med, Cambridge CB2 0QQ, England
[5] Univ Liverpool, Inst Infect & Global Hlth, Dept Clin Infect Microbiol & Immunol, Ronald Ross Bldg,West Derby St, Liverpool L69 7BE, Merseyside, England