[1] Sefako Makgatho Hlth Sci Univ, Dept Virol Pathol, ZA-0204 Pretoria, South Africa
[2] Univ Antwerp, Fac Med & Hlth Sci, Lab Cell Biol & Histol, B-2610 Antwerp, Belgium
[3] Son Healthcare, Algemeen Med Lab AML, B-2020 Antwerp, Belgium
[4] Sefako Makgatho Hlth Sci Univ, Dept Anat Pathol, ZA-0204 Pretoria, South Africa
[5] Sefako Makgatho Hlth Sci Univ, Dept Virol Pathol, Natl Hlth Lab Serv, ZA-0204 Pretoria, South Africa
[6] Sefako Makgatho Hlth Sci Univ, South African Vaccinat & Immunizat Ctr, ZA-0204 Pretoria, South Africa