1. Kumasi Centre for Collaborative Research in Tropical Medicine; Kwame Nkrumah University of Science and Technology; Kumasi Ghana
2. Department of Clinical Microbiology; Kwame Nkrumah University of Science and Technology; Kumasi Ghana
3. Public Health Division; Ghana Health Service; Accra Ghana
4. Port Health Division; Ghana Health Service; Accra Ghana
5. Institute of Virology; University of Bonn Medical Centre; Bonn Germany
6. German Centre for Infection Research; Braunschweig Germany