Nearly A Quarter Of NYC Residents Show COVID-19 Antibodies, Cuomo’s Survey Suggests

NEW YORK, NEW YORK - APRIL 26: Firefighters cheer and make noise in support of the medical workers outside the Mount Sinai Hospital entrance in Manhattan during the the COVID-19 shutdown on April 26, 2020 in New York... NEW YORK, NEW YORK - APRIL 26: Firefighters cheer and make noise in support of the medical workers outside the Mount Sinai Hospital entrance in Manhattan during the the COVID-19 shutdown on April 26, 2020 in New York City. COVID-19 has spread to most countries around the world, claiming over 203,000 lives lost with over 2.9 million infections reported. (Photo by Roy Rochlin/Getty Images) MORE LESS
April 27, 2020 1:30 p.m.

New York Gov. Andrew Cuomo (D) on Monday noted an increase in New York City residents who tested positive for the presence of COVID-19 antibodies in recent days. According to state survey data that he described at a press conference, nearly a quarter of Big Apple residents showed signs of an immune response to the disease.

Crucially, the antibody test used by the state isn’t the same as other tests that show if someone is currently infected with the virus. Rather, the presence of antibodies reflects the past presence of the disease and subsequent immune response.

At a press conference last week, the governor said 21.2% of New York City residents tested had shown antibodies for the disease. On Monday, that number was up to 24.7%. New statewide results described by the governor on Monday showed a percentage point increase to 14.9%, but the governor said that was within the study’s margin of error.

Announcing the initial antibody survey results on Thursday last week, Cuomo said 3,000 adults had been tested outside of grocery stores and other big box stores around the state. On Monday, he said a total of 7,500 people had been tested.

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Cuomo also described a jump between the two phases of the study among Hispanic and Latino New Yorkers.

While 22.5% of Hispanic/Latino New Yorkers had tested positive for COVID-19 antibodies as of April 22, when the governor had shared weighted survey results, 32% of the same demographic had tested positive by April 27, Cuomo said, a nearly 10 point jump.

“Nobody can explain what caused that jump,” Cuomo said, before noting that the state was expanding testing in lower-income, African American and Latino neighborhoods.

The number of black New Yorkers who tested positive for COVID-19 antibodies decreased five points between the two rounds of testing, from 21.1% to 16.9%, Cuomo said. Mortality data from the state shows that black and Hispanic New Yorkers have disproportionately died from COVID-19.

But key data are still missing: The state has not released the numbers behind the governor’s press briefing slide shows, which are based on preliminary results. A spokesperson for Cuomo told TPM Thursday that there was “no set timeline” to release more details of the survey.

The antibody tests, which use blood samples, have been received with some caution by public health authorities.

The World Health Organization, for example, said Friday that “Laboratory tests that detect antibodies to SARS-CoV-2 in people, including rapid immunodiagnostic tests, need further validation to determine their accuracy and reliability.”

The New York survey’s focus on grocery and big box stores may also skew numbers higher, by sampling people who are shopping in public rather than staying home.

Nonetheless, Cuomo asserted Monday that the tests provided “snapshots” of the disease’s presence in New York.

“Snapshot, snapshot, snapshot,” he said. “You look at the different pictures and you have a movie.”

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