Funding for this research was provided by:
Defense Threat Reduction Agency (N/A)
Received: 29 June 2019
Accepted: 17 February 2020
First Online: 24 February 2020
Ethics approval and consent to participate
: The study was approved by the Kenya Medical Research Institute Scientific Ethical Review Committee (No. 2193) and Centers for Disease Control and Prevention Institutional Review Board and all participants gave written informed consent before enrolment.
: Not applicable.
: The authors declare that they have no competing interests.