I've always assumed that in ales and lagers the beer yeast is out competing these microbes. If not you have an infection.
I eat a spoonful of yogurt and some kim chi or sauerkraut every day. I also regularly consume miso and use kefir and drink kombucha occasionally. I also don't avoid "germs" except when I feel tired or hung over so that I have exposure. I drink at least a little alcohol several days a week, including lots of mead and beer.
I can't say for sure if all the probiotics are the reason, but I haven't been sick, even for a day, in 16 years, except the occassinal afore-mentioned hangover.