According to Spanish researchers, tolerance to cats can be built up in allergic kids by placing increasing doses of standardized cat dander extract under the tongue.

Immunotherapy is based on the idea that the immune system can "learn" to tolerate allergy triggers if it is exposed to gradually increasing amounts of the offending allergen, starting with tiny amounts that don't cause an allergic reaction.

In sublingual immunotherapy, or SLIT, the allergen is placed under the tongue, where it is absorbed into the system.

I wonder if kids will agree to this treatment, cat dander extract isn't exactly candy.

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