World Health Organization (WHO) - World Health Organization Regional Office for Europe, UK Health Security Agency, Government of the United States of America - Centers for Disease Control and Prevention (CDC), Chaim Sheba Medical Center - Infection Prevention & Control Unit, European Centre for Disease Prevention and Control, Epiconcept, Government of Albania - Institute of Public Health, U.S. Naval Medical Research Unit No. 6, Government of the United States of America - Centers for Disease Control and Prevention (CDC), National Center for Disease Control and Public Health, St. James Hospital - Department of Infectious Diseases, Republic of Azerbaijan, affiliation not provided to SSRN, Thailand MOPH - U.S. CDC Collaboration, UK Health Security Agency, Public Health England Colindale, Public Health England Colindale, World Health Organization (WHO) - World Health Organization Regional Office for Europe, Government of the United States of America - National Center for Immunization and Respiratory Diseases and Public Health England Colindale