The concern for others is obviously pertinent, Jim. But if we're discussing infection rates, it doesn't really matter. Once somebody has it, they have it. In fact, if their symptoms are more severe they are less likely to be out and about and so less likely to infect anybody else. I think the increased risk because of vulnerability (whether due to age or anything else) is a risk that individuals must assess for themselves because, by and large, they will be the ones on the receiving end of any bad outcomes.