[1] Univ Malawi, Coll Med, Pathol Dept, Blantyre, Malawi
[2] Malawi Liverpool Wellcome Trust Clin Res Programm, Blantyre, Malawi
[3] Univ Malawi, Coll Med, Biomed Sci Dept, Blantyre, Malawi
[4] Malawi Univ Sci & Technol, Acad Med Sci, Limbe, Malawi
[5] Univ Liverpool, Inst Infect & Global Hlth, Liverpool, Merseyside, England
[6] Univ Cambridge, Dept Vet Med, Cambridge, England