The CDC shortened its recommended isolation time from 10 days to five days for people who test positive for COVID-19 and are asymptomatic. People who were sick but whose symptoms are improving and don’t have a fever can also leave the house after five days, as can those who were exposed to COVID-19 but are fully vaccinated. The CDC says the change is based on scientific evidence that most transmission occurs early in the disease, right before and after the onset of symptoms. (Articles here, here, here, here, and here)