Why do we lose immunity to viruses over time, but our immune response to allergens stays the same?
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Basically it’s like an attack dog. It’s response will be the same to any intruder that comes on the property (allergens/squirrels and actual viruses/theives) but will, given enough time forget about specific people it’s identified as an actual threat that it previously could identify by smell if it doesn’t see them for a long time.
To keep that metaphor going, allergens are like squirrels coming on the property – you know they are harmless, but your immune system attack dog will still treat them as a threat. And there are a lot more squirrels than thieves around.
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