Please Scroll Down to See Forums Below 
Most of those conditions are caused by the cat being allowed to go outside regularly or live outside most of the time and many of those only occur when the animal's immune system is in poor condition.
I've lived in extremely close quarters with cats nearly my entire life. The only thing I've EVER gotten was ringworm, once, and that was when my mother in law acquired a new cat from another breeder. It took a grand total of two days to eliminate with an over the counter spray (BTW, it's in the same family as Athlete's foot or jock itch).
The problem with America, in particular, is we've become germophobes, obsessively trying to create a sterile living environment. That's neither practical, feasible, nor healthy (there is a theory that people are developing such screwing allergies is that we're TOO clean as children, not letting our immune systems develop naturally).
