When COVID-19 first started spreading in the United States, the Centers for Disease Control and Prevention put out a short list of symptoms to watch out for: fever, cough, and shortness of breath. As research on the novel coronavirus and testing expanded, the official list grew to a total of nine symptoms in April. Now, the agency has once again added three more signs of coronavirus to its list: congestion or runny nose, nausea or vomiting, and diarrhea. The CDC didn’t make an official announcement about the additional symptoms—they just appeared on the agency’s official list. (Plus, they may not exactly ...