• A couple of thoughts come to mind. Firstly, the cat allergy is almost certainly due to the cat dander - dried aerosolised saliva from the cat. Different cats could produce different amounts of dander which may be an explanation. Another option is that, just as all cats look different, they may have subtly different allergens in their saliva, and you simply don't react as strongly to one as another. I too have noticed the same effect in the past, where one cat can make me wheeze and my eyes water, but another doesn't affect me at all. Another thing to consider is that your own tolerance to the allergens in the saliva can vary, so that one day you are more sensitive than another, for example if there is also smoke in the air, you have a cold or other allergies that are being triggered at the same time.

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