— Stanford says masks are no longer mandatory, but are recommendedParticipants in a long COVID clinical trial at Stanford University in California have raised concerns that some investigators there are not wearing masks during clinic visits, putting them at risk. The issue was first highlighted in a Reddit post on r/covidlonghaulersopens in a new tab or window, where an anonymous poster said he or she and their wife walked out and quit the study last week because "researchers running the long COVID Paxlovid study have stopped masking while tending to long COVID participants." That commenter, who has not returned a...