Jill Biden has tested positive for COVID-19 while vacationing in South Carolina with her family, including President Joe Biden, and is experiencing mild symptoms, the White House said Tuesday.Elizabeth Alexander, the first lady's communications director, announced the positive test, saying she will remain in South Carolina until she receives two negative COVID-19 tests. «After testing negative for COVID-19 on Monday during her regular testing cadence, the First Lady began to develop cold-like symptoms late in the evening,» Alexander said in a statement. «She tested negative again on a rapid antigen test, but a PCR test came back positive.