If you're working with ferals and strays - especially if you're trapping and you may be trapping skunks and raccoons (or other wildlife) in addition to the cats, you might want to consider getting a rabies vaccination! I don't know why we never thought of it before, but our vet just asked us about it, and it seems like pretty good advice to me. There was only one reported case of rabies contracted by a person in a nearby county last year (I don't know about ours!), and it was a man cleaning his attick and he awoke nesting bats.... but given that the disease is fatal, this is certainly something that anyone working with ferals & strays really ought to consider.