When I was undergoing treatment for colorectal cancer about eight years ago, it was really important that I stay away from other people, especially large groups. The chemotherapy drugs I was on made me more susceptible to infections, so I was already in the hospital quite a bit. I got bladder infections, kidney infections, you name it. I even got the MRSA “superbug” once.

But I was still so tired at that point that I was fine with...