Funding for this research was provided by:
Bill and Melinda Gates Foundation (NA)
Received: 13 June 2019
Accepted: 13 August 2019
First Online: 19 August 2019
Ethics approval and consent to participate
: This study was approved by COMREC (P.07/18/2438) and LSTM Research Ethics Committee (18-066). All parents will provide written informed consent in accordance with Malawi national guidelines.
: Not Applicable
: Dr. Pui-Ying Iroh Tam is an editorial board member for BMC Infectious Diseases. All the other authors report no competing interests.