A clinical trial evaluating a vaccine designed to protect against the new coronavirus will begin Monday
Public health officials say it will take a year to 18 months to fully validate any potential vaccine. This is still a record pace.
For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough.
The vast majority of people recover. According to the World Health Organization, people with mild illness recover in about two weeks, while those with more severe illness may take three weeks to six weeks to recover.