[1] Univ Manitoba, Dept Med Microbiol, Lab Viral Immunol, Winnipeg, MB R3E 0W3, Canada
[2] Univ Manitoba, Dept Community Hlth Sci, Winnipeg, MB R3E 0W3, Canada
[3] Univ Manitoba, Dept Med, Winnipeg, MB R3E 0W3, Canada
[4] Cadham Prov Lab, Winnipeg, MB, Canada
[5] Univ Nairobi, Dept Med Microbiol, Nairobi, Kenya