[1] Natl Hlth Lab Serv, Dept Virol, Port Elizabeth, South Africa
[2] Stellenbosch Univ, Dept Pathol, Div Med Virol, Cape Town, South Africa
[3] Nelson Mandela Cent Hosp, Dept Paediat, Mthatha, South Africa
[4] Walter Sisulu Univ, Mthatha, South Africa
[5] Walter Sisulu Univ, Dept Publ Hlth, Mthatha, South Africa
[6] Eastern Cape Dept Hlth, Outbreak Response Team, Port Elizabeth, South Africa