Funding for this research was provided by:
Else Kröner-Fresenius-Stiftung (1601079)
Received: 9 November 2020
Accepted: 15 January 2021
First Online: 1 February 2021
Ethics approval and consent to participate
: Ethical clearance (CREC/109/2016) for the use of sera and DBS-derived specimens was obtained from a Joint CUHAS/BMC ethics review committee of the Catholic University of Health and Allied Sciences (CUHAS) and Bugando Medical Centre (BMC). Ethical approval of the study was also obtained from the National Institute of Medical Research (NIMR) of Tanzania (NIMR/HQ/R.8a/Vol.IX/2641) including Data and Material Transfer Agreements.
: Informed written consent was obtained from a parent or guardian of each child enrolled in the study.
: The authors declare that they have no competing interests.