Couples tend to avoid fine dining when they are plagued by constant coughing. Families probably won’t visit the movies if several of their noses need frequent wiping. The elderly and others with compromised immune systems may limit their visitors to those who are clearly healthy. And a school visiting nursing homes may not include symptomatic children when it stops by to share.
But on Sundays, many of these groups will mix at church. And it will be volunteers, not school nurses, who will be confronted with the weekly dilemma of which babies can be allowed in the nursery and which should be sent home.