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Coronavirus: New York survey suggests 2.7 million in state may have Covid-19 antibodies

New York, United States - Governor Cuomo says the implied fatality rate of 0.5 per cent of those infected by Covid-19 was lower than some experts feared.

New York Governor Andrew Cuomo said on Thursday a preliminary survey found that nearly 14 per cent of residents tested positive for antibodies against the novel coronavirus, suggesting that as many as 2.7 million New Yorkers may have been infected with the disease.
While noting the sample size of 3,000 people and other limitations of the survey, Cuomo said the implied fatality rate of 0.5 percent of those infected by Covid-19, the respiratory illness caused by the virus, was lower than some experts feared.
"If the infection rate is 13.9 per cent, then it changes the theories of what the death rate is if you get infected," Cuomo told a daily briefing.
The survey targeted people who were out shopping, but not working, meaning they were not essential workers like grocery clerks or bus drivers but were more likely to test positive for antibodies than someone isolated at home, Cuomo said.
Even after discounting for those caveats, Cuomo said the preliminary data added to his understanding of the virus and would inform his reopening plan, with social-distancing measures relaxed more quickly in less infected regions of the state.
Cuomo said the state would keep adding to the sample size in the coming weeks and would test more in African-American and Hispanic communities, which made up disproportionately high percentages of positive tests in the survey so far, with whites registering a disproportionately lower infection rate.
"I want to see snapshots of what is happening with that rate - is it going up, is it flat, is it going down," Cuomo told a daily briefing. "It can really give us data to make decisions."
The infection rate implied by the New York survey was less than 4.1 per cent found in a similar but smaller study of Los Angeles County residents released earlier this week.
That survey, conducted by University of Southern California researchers on 863 people, also suggested a death rate that was lower than previously thought but also that the virus may be being spread more widely by people who show no symptoms.
Among other limitations, Cuomo said the official death count of 15,500 was surely an undercount because it only included people who had died in hospitals or nursing homes and not those who expired at home without a Covid-19 diagnosis.
The true death toll could result in a higher fatality rate than the survey's 0.5 per cent, which was calculated by dividing the estimated number of infected -- 14 per cent of New York's 19 million residents, or 2.7 million people -- by the 15,500 figure.
Stephen Hawes, chair of the University of Washington's department of epidemiology, said he believed it was likely that New York's survey was overestimating the infection rate somewhat by targeting people moving around in society.
And while cautioning that the survey had not been peer reviewed and that antibody tests can be inconsistent, he said it was a step toward filling the "huge gaps" still confounding experts trying to understand transmission of the disease.
He also noted that it was unclear whether testing positive for antibodies meant a person had achieved immunity.
"Moving forward until those studies are done we won't know what it means for someone to be antibody-positive," he said.
Over the past week, Cuomo has increasingly turned his attention to ramping up testing as hospitalisations, intubations and other metrics continue to improve, suggesting the state hit hardest by the pandemic has likely passed the worst stage.
Cuomo told a daily briefing that hospitalisations fell by 578 to 15,021 patients on Wednesday, the 10th straight day of decline. He reported an additional 438 coronavirus deaths, down from 474 a day earlier and the lowest total since April 1.