Washington State University - Global Health Kenya, Washington State University - Global Health Kenya, US Centers for Disease Control and Prevention (CDC) - Center for Global Health Research, Kenya, Kenya Medical Research Institute (KEMRI) - Center for Global Health Research, University of Nairobi - KAVI-Institute for Clinical Research, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Washington State University - Global Health Kenya, Washington State University - Paul G. Allen School of Global Health, Kenya Medical Research Institute (KEMRI) - Centre for Global Health Research, Nairobi Metropolitan Services - Department of Health, Nairobi Metropolitan Services - Department of Health, Washington State University - Global Health Kenya, Jomo Kenyatta University of Agriculture and Technology - School of Public Health, Washington State University - Global Health Kenya, US Centers for Disease Control and Prevention (CDC) - Center for Global Health Research, Kenya, Kenya Medical Research Institute (KEMRI) - Center for Global Health Research, Kenya Medical Research Institute (KEMRI) - Center for Global Health Research, Emory University - Emory Global Health Institute, University of Nairobi - KAVI-Institute for Clinical Research, Washington State University - Paul G. Allen School of Global Health, US Centers for Disease Control and Prevention (CDC) - Center for Global Health Research, Kenya, US Centers for Disease Control and Prevention (CDC) - Center for Global Health Research, Kenya and Washington State University - Global Health Kenya

Government of the United States of America - Centers for Disease Control and Prevention (CDC), University of St Andrews, Government of the United States of America - Influenza Division, affiliation not provided to SSRN, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Washington State University - Global Health Kenya, Kenya Medical Research Institute (KEMRI), Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Government of Kenya - Kenya Ministry of Health, Washington State University - Paul G. Allen School of Global Health, Government of the United States of America - Centers for Disease Control and Prevention (CDC), Washington State University - Global Health Kenya, Government of Kenya - Kenya Ministry of Health and Washington State University - Global Health Kenya