My DH and I were both vaccinated against smallpox when we were children.
In the early 80’s my husband had to travel to a country where smallpox boosters were recommended, however, the nurse who would have given him the shot advised him against it since I had a skin-related auto-immune disease.
So your husband was told not to get the smallpox shot because -you- had the autoimmune skin condition?
That means the shots shed for some amount of time.
If smallpox shots shed, do other shots shed also?
Such as covid shots?