One-third of 565 Japanese citizens who were evacuated from Wuhan, China in February that tested positive for coronavirus infection never developed COVID-19 symptoms; and a study out of China reports more than half of infected children had no symptoms or only mild symptoms. The CDC estimates up to 40% of infected individuals do not experience symptoms.
That’s good news for the affected individuals, but bad news for public health because people who are infected but don’t have symptoms can unintentionally spread the virus to others. This is why disease vaccination is so important.
Public health officials are asking all people to dramatically limit social contact to prevent the spread of disease. Wearing a cloth facial covering when you go to a public indoor place protects others because you could be infected and not know it. Wearing a mask reduces the risk of unknowingly spreading the virus to others in the space around you.