I sure hope precious little Minion gets better soon. Has it been determined if it WAS the advantage, or maybe the timing was just coincidential.
on the vaccination subject, many years ago I too did not vaccinate regularly, and when a kitty became ill and needed to be hospitalized they had to put him in a quarrentine area, which turned out to be SOOOOOO much more expensive. I never took that chance again, and have been vaccinating regularly ever since. (even if I do belive it is a bit of a "racket")