Get the latest Science News and Discoveries

COVID-19 was spreading in the US by December 2019, mounting evidence suggests


None

Get the Android app

Or read this on Live Science

Read more on:

Photo of COVID

COVID

Photo of US

US

Related news:

News photo

Data and safety review board reports how it monitored the COVID-19 vaccine trials

News photo

For transplant recipients, third time may be the charm for better COVID vaccine protection

News photo

Two COVID-19 vaccines show safety, strong immunity in infant model