The data are particularly crucial as a national debate has emerged over when and how to begin to ease lockdowns.
If those infection rates are correct, it could mean that more than 2.7 million people in New York — and about 1.8 million people in New York City alone — have been infected, far more than the state's 257,216 confirmed cases.
But some have called into question the accuracy of some antibody tests and how the early studies have accounted for the possibility of false-positive results. The New York City Department of HealthThe tests used in New York were developed by the Wadsworth Center, a public health laboratory of the state Health Department.
But Florian Krammer, a professor of vaccinology at the Icahn School of Medicine at Mount Sinai in Manhattan, questioned the infection rate for New York City, saying it seemed too high. Some scientists also criticized the the Stanford survey's methodology, claiming that the way people were recruited for testing — through ads on Facebook — introduced biases likely to have skewed the results.
In New York, the fatality rate based on the number of official cases was more than 7 percent, but that number was long thought to have been inflated because diagnostic testing shortages meant only the most serious cases were being confirmed.
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