Researchers identified antibodies for the virus in blood plasma samples taken from a small population during the week of February 23, according to a study published on Tuesday in Nature.
This is a week before the first case of COVID-19 was identified on February 29, at the city's Mount Sinai Hospital. The case was then confirmed on March 1, and infections in the city rocketed in mid-March.
The findings suggest "that SARS-CoV-2 was likely introduced to the NYC area several weeks earlier than previously assumed," the scientists performing the study said.
The scientists were from the Icahn School of Medicine at Mount Sinai and Mount Sinai Health System.
They added that this would not be unexpected, because of the number of tourists in the city coming from regions with high infection rates. But the team "cannot exclude with absolute certainty" that some results are false positives, they said.
The scientists used more than 10,000 plasma samples from patients at Mount Sinai Hospital to analyze SARS-CoV-2 antibodies in weekly intervals, from the beginning of February to July 2020. The samples were collected for research and the team didn't begin their analysis until mid-March.
Around one in five New York City residents had been infected by the virus by late May, the researchers found.
New York state has recorded 25,853 COVID-19 fatalities as of Monday, including more than 19,000 in New York City.
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