CDC director: Over 90% of Americans are still susceptible to Covid-19

A majority of the U.S. remains susceptible to a coronavirus infection, Dr. Robert R. Redfield, director of the Centers for Disease Control and Prevention, told lawmakers Wednesday. For access to live and exclusive video from CNBC subscribe to CNBC PRO: https://cnb.cx/2NGeIvi

A majority of the U.S. remains susceptible to a coronavirus infection, Dr. Robert Redfield, director of the Centers for Disease Control and Prevention, told lawmakers Wednesday.

Covid-19 has spread across America at varying rates since it crossed U.S. shores in January, infecting as much as 15% to 20% of the population in some states and less than 1% in others, he said. One state said almost a quarter of its residents have had the coronavirus sometime this year, he added.

He said the CDC is in the process of a “very large” study that seeks to more precisely determine how widely the virus has spread across the country.

The rate of infection is important because epidemiologists think infection generally conveys some immunity against the virus for at least a few months.

“The preliminary results in the first round show that a majority of our nation, more than 90% of the population, remains susceptible,” he said at a Senate hearing hosted by the Committee on Health, Education, Labor and Pensions. “A majority of Americans are still susceptible.”

The coronavirus has infected more than 6.8 million people across the U.S., or roughly 2% of the U.S. population, according to data compiled by Johns Hopkins University and the U.S. Census Bureau. However, the true spread of the virus is likely much higher, Redfield has previously said, as many mild and asymptomatic cases go undiagnosed.

The comments cast even greater doubt on the feasibility of achieving so-called herd immunity, which is reached when enough of the population has developed immunity against the virus so that it cannot efficiently spread. Most scientists say 60% to 80% of the population needs to be vaccinated or develop antibodies through natural infection to achieve herd immunity, top World Health Organization officials have previously said.

Critics of business closures and public health restrictions meant to curb the spread of the virus have pointed to herd immunity without a vaccine as a potential solution to the pandemic. However, WHO officials and many epidemiologists have criticized the strategy because it would likely lead to widespread disease and death.

White House coronavirus advisor Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said last month that allowing the virus to spread without control to achieve herd immunity would bring the death toll to a level that’s “totally unacceptable.”

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