Former Vice President Joe Biden and his wife, Dr. Jill Biden, have tested negative for COVID-19, his campaign announced Friday. The Bidens had the PCR test, which can detect the presence of an antigen, meaning it can be effective earlier than antibody tests.
Biden was onstage debating with Donald Trump for more than 90 minutes Tuesday night, and Trump may have begun showing mild symptoms as early as Wednesday evening before his late Thursday night/early Friday morning positive test. That means that, while the negative test is excellent news, Biden will still need to be cautious, as the average incubation period could stretch several more days.