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This is true. in general, a vaccine protects against viruses, usually by providing a killed or attenuated version of the virus into the subject so that the subject (in this case the chick)'s own immune system can create antibodies against it. That way, in the future, if the chick comes...
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LET IT GO!
from a male perspective
I agree, let it go. He admitted he was wrong. Life is too short to let it continue to get to you. I've been married 35+ years and there are some things you can either keep carrying around and let it bother you , or let it go and go on with life.