Article: Do pets prevent allergic disease? The weight of the evidence favors a preventive role.(Point/Counterpoint)

Although there are some inconsistencies in the evidence, most of it supports the hypothesis that having pets in the home prevents the development of allergic disease.

First some caveats, however: Not all pets are created equal. The evidence is strongest for furred pets, as most studies have been done with regard to dogs and cats.

Second, allergic disease represents a range of conditions. In some of the studies, the outcome is asthma; in others, the outcome is allergic sensitization; and some studies focus on symptoms. Sensitization is obviously not itself a disease, but it's a useful indicator of the risk for asthma.

Third, the findings may differ depending on the ...

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