 | A zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation. |
| | A zoo employee is more likely than a person in the general population to keep one or more animal pets at home |
| | The percentage of the general population whose level of exposure to animals matches that of a zoo employee is quite small. |
| | Exposure to domestic pets is, on the whole, less likely to cause animalinduced allergy than exposure to many of the animals kept in zoos. |
| | Zoo employees seldom wear protective gear when they handle animals in their care. |