COVID-19 spread undetected in U.S., Europe earlier than believed, study shows, offering lessons for future outbreaks, including transmission of omicron variant
Thursday December 2, 2021
Local COVID-19 transmission was underway in California, New York, Florida and Texas well before the first reported U.S. case in Washington state on Jan. 20, 2020, according to a new study published in Nature, which indicates the virus spread much earlier and faster in the United States and Europe than previously thought