CDC chief says coronavirus cases may be 10 times higher than reported

Agency expands list of people at risk of severe illness, including pregnant women. The number of people in the United States who have been infected with the coronavirus is likely to be 10 times as high as the 2.4 million confirmed cases, based on antibody tests, the head of the Centers for Disease Control and Prevention said Thursday. CDC Director Robert Redfield’s estimate, shared with reporters in a conference call, indicates that at least 24 million Americans have been infected so far. The antibody tests examine a person’s blood for indicators that the immune system has mounted a response to an infection. The serological surveys are being done around the country as epidemiologists try to measure the reach of the virus to date. Redfield said he believes 5 to 8 percent of the population has been infected so far.