復陽

to test positive again (for COVID-19) after previously testing positive and then later, negative; to have a rebound positive test result

to go and return / to return / to resume / to return to a normal or original state / to repeat / again / to recover / to restore / to turn over / to reply / to answer / to reply to a letter / to retaliate / to carry out

positive (electric.) / sun / male principle (Taoism) / Yang, opposite: 陰|阴[yin1]