[1] Wellcome Trust Res Labs, Blantyre, Malawi
[2] Univ Malawi, Coll Med, Dept Paediat, Zomba, Malawi
[3] Ctr Dis Control & Prevent, Viral Gastroenteritis Unit, Atlanta, GA 30333 USA
[4] Akita Univ, Sch Med, Dept Microbiol, Akita 010, Japan
[5] NIAID, Infect Dis Lab, NIH, Bethesda, MD 20892 USA
[6] Univ Liverpool, Sch Trop Med, Liverpool, Merseyside, England
[7] Univ Liverpool, Dept Med Microbiol & Genitourinary Med, Liverpool L69 3BX, Merseyside, England