Yes, they just can't have relationships with them.
Antigens are any molecules that elicit adaptive immune response. Antigens protrude from pathogens or other intruding substances. Antibodies are proteins found in blood plasma that attach to one particular kind of antigen and help to counter its effects.
So Salmonella wouldn't be on it, which causes disease
No, a perspiration drug need a prescription from a doctor that says you can have this drug, how much you get, how often you take it, and when you can get it refilled.<span />