Dear Amy: A bunch of us blood cancer patients, as well as others with compromised immune systems, are starting to find out through blood tests that even though we have been fully vaccinated, we were unable to develop antibodies to COVID. I dealt with serious side effects from the vaccine, and unfortunately have zero antibodies to the virus. As depressing as that is (I’ll need to wear a mask pretty much forever, always living in a pre-vaccine world), my bigger concern is how to share this with friends and family who are celebrating and burning their masks. Most are living by the rule that, “As long as you have been vaccinated, pull up a stool and sit by me.” Well, Amy, I have been vaccinated, but only I know that it didn’t do any good. How do I handle that?