C.D.C. Data Shows U.S. Coronavirus Infections Much Higher Than Reported

The number of people infected with the coronavirus in different parts of the United States was anywhere from two to 13 times higher than the reported rates for those regions, according to data released Tuesday by the Centers for Disease Control and Prevention.

The findings suggest that large numbers of people who did not have symptoms or did not seek medical care may have kept the virus circulating in their communities.

The study indicates that even the hardest-hit area in the study — New York City, where nearly one in four people has been exposed to the virus — is nowhere near achieving herd immunity, the level of exposure at which the virus would stop spreading in a particular city or region. Experts believe 60 percent of people in an area would need to have been exposed to the coronavirus to reach herd immunity.

The analysis, based on antibody tests,

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States Must Standardize Coronavirus Data, Former C.D.C. Director Says

As criticism of the Trump administration’s response to the coronavirus pandemic intensifies, a former director of the Centers for Disease Control and Prevention on Tuesday called on state health officials to start reporting coronavirus data in a detailed and uniform fashion, rather than the disorganized hodgepodge most states now produce.

Other public health experts said that such guidelines were long overdue and that the agency’s current director, Dr. Robert Redfield, should have mandated them months ago.

The lack of clear C.D.C. guidance — even on simple issues like data collection — was an example of the administration’s ineptitude and ineffective leadership in the face of a growing crisis, experts said.

“We have a real vacuum of leadership at the national level,” said Dr. Thomas R. Frieden, the former C.D.C. director, who now runs Resolve to Save Lives, a nonprofit health advocacy initiative.

“Absent a national strategy, our best hope is

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Actual Coronavirus Infections Vastly Undercounted, C.D.C. Data Shows

The number of coronavirus infections in many parts of the United States is more than 10 times higher than the reported rate, according to data released on Friday by the Centers for Disease Control and Prevention.

The analysis is part of a wide-ranging set of surveys started by the C.D.C. to estimate how widely the virus has spread. Similar studies, sponsored by universities, national governments and the World Health Organization, are continuing all over the world.

The C.D.C. study found, for instance, that in South Florida, just under 2 percent of the population had been exposed to the virus as of April 10, but the proportion is likely to be higher now given the surge of infections in the state. The prevalence was highest in New York City at nearly 7 percent as of April 1.

“This study underscores that there are probably a lot of people infected

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Scientists Question Medical Data Used in Second Coronavirus Study

Since the outbreak began, researchers have rushed to publish research about the new coronavirus spreading swiftly through the world. On Tuesday, for the second time in recent days, a group of scientists has questioned the data used in studies in two prominent medical journals.

A group of scientists who raised questions last week about a study in The Lancet about the use of antimalarial drugs in coronavirus patients have now objected to another paper about blood pressure medicines in the New England Journal of Medicine, which was published by some of the same authors and relied on the same data registry.

Moments after their open letter was posted online Tuesday morning, the editors of the N.E.J.M. posted an “expression of concern” about the paper, and said they had asked the paper’s authors to provide evidence that the data are reliable.

The Lancet followed later in the day with a statement

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