Serologic tests, as they’re called, look for antibodies in the blood. Antibodies develop when you’ve been exposed to a particular infection, and experts believe many COVID-19 cases are so mild people may not know they had it. That means there’s a chance a significant number of us have developed antibodies already.
“We don’t currently have good numbers for the numbers of people who are infected now, much less people who were infected before who were never tested,” Angela Rasmussen, MD, a virologist at Columbia University in New York, told. “So it’s really important from an epidemiological perspective to do these types of serology assays.
“We don’t know which antibody response neutralizes the virus,” says Joseph Vinetz, MD, a professor of infectious diseases at Yale University. “Once you have an antibody test, you have to study people with antibody responses for their risk for getting a new infection.”
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