“As I always joke around when people ask me, I don’t want to be the Grinch that steals Halloween and the Grinch that steals Thanksgiving,” the country’s leading infectious disease expert told Survivor Corps, a group focused on fighting the coronavirus. “But I would really be careful about having kids just going from house-to-house, unless as part of their costume they had a mask and you made sure that they had a little Purell with them after each house [and] they would wipe their hands off.”