*Raises hand*.   In 1983, I was working with nice, juicy, fresh, bloody human tissue in a research lab when Hepatitis B vaccine was developed.  The original vaccine, the one that was derived from blood, not the much safer recombinant vaccine.   I was told, "get the vaccine, or Get Out - look for another job".  The hospital/med school and its health insurer didn't want to be responsible for Hep B treatment for employees when the disease was preventable by vaccine.