The number of people affected by Covid-19 infection in the U.S. has nearly quadrupled since 2015, and nearly one-third of those infected are still awaiting diagnosis.
The Centers for Disease Control and Prevention reported Wednesday that the number of cases rose to more than 4,000 this year, up from about 1,300 in 2016.
The latest figures also show that more than 10,000 people have recovered, a milestone that was reached in a new study released Thursday by researchers at Johns Hopkins University and at the University of California, Berkeley.
The study also found that more people are living longer than in past years, and that more of the people affected are older.
A total of 7,000 of the more than 3,000 who have recovered were in the first year of the epidemic, according to the CDC.
The new study was done in collaboration with Johns Hopkins, the University and the National Institute of Allergy and Infectious Diseases.
In addition to the researchers, Johns Hopkins researchers contributed to the report.
The researchers looked at the incidence of the virus in people who had received care in a hospital setting and in people with other diagnoses, such as pneumonia and heart failure.
They also compared those cases to people who did not receive care.
“We saw a dramatic increase,” said Dr. Anthony Fauci, who led the study.
“There’s been an enormous surge in the number and the severity of cases and that is a good sign that we are making progress.”
Fau, who was not involved in the study, called the findings “a real miracle.”
“I think the fact that we can actually get to the point where there’s a substantial number of folks that have gotten better and have stabilized, and we can move to the stage where we can see a very significant decrease in the virus burden in the United States, is really, really, what we need,” he said.
“This is a very, very, critical milestone.”
The new findings came from the study of more than 200,000 Covid cases in the entire U.