It's potentially relevant to people who have compromised immune systems or who are on immunosuppressants. Depending on when you grew up it is likely that those

It's potentially relevant to people who have compromised immune systems or who are on immunosuppressants. Depending on when you grew up it is likely that those two groups are more prevalent, or at least are more likely to fly than before (think HIV and autoimmune disorders). But for most people the "germs are everywhere" thing is pretty overblown.