Funding for this research was provided by:
Thrasher Research Fund (12440)
Deutscher Akademischer Austauschdienst
Received: 29 April 2019
Accepted: 8 December 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: Ethical and institutional approval was obtained from the Medical Research Council of Zimbabwe and the University of Zimbabwe (MRCZ/A/1964). The study aims and procedures were explained in the local language, Shona, prior to enrolment. Written informed consent was obtained from parents or guardians of the participants.
: Not applicable.
: Co-author Takafira Mduluza is an Editorial Board Member for BMC Infectious Diseases. The rest of the authors declare that there is no conflict of interest.