Mexico reported its highest single-day death toll on Tuesday, after 501 people died from the coronavirus, per data from Johns Hopkins and the country's health ministry.
By the numbers: Almost 5.5 million people have tested positive for the virus as of Tuesday, and more than 2.2 million have recovered. The U.S. has reported the most cases in the world (over 1.6 million from 14.9 million tests).
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Coronavirus antibody tests are still relatively unreliable, and it's unclear if people who get the virus are immune to getting it again, the Centers for Disease Control and Prevention cautioned on Tuesday.
What they're saying: The agency explicitly warned against using antibody tests to determine whether someone should return to work or to group people within schools or prisons.