Coronavirus Antibody Tests Are No Back-to-Work Passport

After weeks of warning that treatments and vaccines for Covid-19 could be months away, scientists are showing enthusiasm for one line of attack that’s not so distant: widespread testing for the presence of antibodies. These “serology tests,” as they’re called, could indicate a past infection — and some degree of protection against getting the coronavirus again.

That’s important because scientists know that the 1.5 million cases worldwide represent only the tip of the iceberg. There are many more people who never got sick enough to seek out a test. In theory, antibody testing could identify those people and give them a sort of Covid-19 license or passport to re-enter the workforce, or help out in hospitals and labs battling the disease.