Community transmission of the coronavirus in the U.S. probably began in late January or early February, according to a recent CDC report.
May 30, 2020 - Community transmission of the coronavirus in the U.S. probably began in late January or early February, according to aUntil late February, COVID-19 case numbers were too low to be detected by the CDC’s surveillance system that looks for flu-like illnesses based on emergency department records across the country.
Between Jan. 21 and Feb. 23, the U.S. had 14 COVID-19 cases that were related to travel from China. The first non-travel case was confirmed on Feb. 26 in a California resident who became ill on Feb. 13, according to the report. Two days later, a second non-travel case was confirmed in Washington. That means that the virus was spreading in communities by late February, the team concluded, and the first cases came weeks before that.
Syndromic surveillance in counties that were affected early in the pandemic didn’t show an increase in emergency room visits for COVID-19 before Feb. 28, they wrote. Retrospective testing of 11,000 samples didn’t find positive samples before Feb. 20.
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