People who have spent a lot of time in contact with animals often develop animal-induced allergies, a significant percentage of which are quite serious  In a survey of current employees in major zoos, about 30 percent had animal-induced allergies
However, a zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation
There is no occupation for which the risk of developing an animal-induced allergy is higher than 30 percent.