Oh noes!! What is that crazy Doctor Robison writing about NOW that has nothing to do with cats??
Well, patience has its virtue. Do read on at this link, because cowpox has more relevance to cats and their owners than it does dogs, as Scott Weese over at Worms and Germs explains.
I don't think we have endemic cowpox in our local rat population, but it is always possible. So it's one MORE reason to keep your cats indoors to minimize their contact with wild rodents.
I don't spend time worrying about this one, perhaps because I am fond of our friend cowpox, which gave us the smallpox vaccine (smallpox being the only deadly human virus mankind has ever completely wiped out in nature, a huge public health victory). Read more about that here.