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Evidence suggests COVID-19 was in US by Christmas 2019 There was probably very rare and sporadic cases here earlier than we were aware of. But it was not widespread and didn t become widespread until late February Author: Mike Associated Press  A new analysis of blood samples from 24,000 Americans taken early last year is the latest and largest study to suggest that the new coronavirus popped up in the U.S. in December 2019 weeks before cases were first recognized by health officials.  The analysis is not definitive, and some experts remain skeptical, but federal health officials are increasingly accepting a timeline in which small numbers of COVID-19 infections may have occurred in the U.S. before the world ever became aware of a dangerous new virus erupting in China.

United statesHarvard universityAmerican red crossNatalie thornburgWilliam hanageKeri althoffCenters for diseaseNational institutes of healthJohns hopkins bloomberg school of public healthAssociated pressDisease controlClinical infectious diseasesNational institutesChristmas eveJohns hopkins bloomberg schoolPublic health