Is it time to wear face coverings when going to the grocery store, pharmacy or medical appointments? That is the latest advice from Riverside County, Calif., health officials as they try to slow the spread of the coronavirus, which has sickened more than 8,500 people in the state and killed nearly 200. Federal officials maintain that healthy people do not need to wear masks in most circumstances, but there does seem to be a growing belief that more people should be covering their faces more often. Here is what we know: