CDC Announces First US Case of Coronavirus With Unknown Origin

A worshipper (L) wears a face mask to protect against the coronavirus while sitting in a pew at the Cathedral of Our Lady of the Angels on Ash Wednesday on Feb. 26, 2020 in Los Angeles, Calif. Mario Tama/Getty Images

Health officials announced on Feb. 26 that the latest confirmed case of COVID-19 in an individual in Northern California may be the country’s first case of human-to-human transmission from an unknown source.

The Centers for Disease Control and Prevention said in a statement on Wednesday night that the patient has no known sources of exposure, like close contact with confirmed carriers of the virus.