National Institute of Allergies and Infectious Disease U.S. Director Dr. Anthony Fauci: "In all the history of respiratory-borne viruses of any type, asymptomatic transmission has never been the driver of outbreaks. The driver of outbreaks is ALWAYS a symptomatic person."

World Health Organization Emerging Diseases and Zoonosis Unit head Maria Van Kerkhove said coronavirus transmission by people who aren’t showing symptoms is "very rare.” She spoke at a briefing in Geneva.