MSc immunology here.
After a bit of googling (allergies aren’t my specific expertise and I wasn’t sure if there was some fundamental difference between pollen and shellfish antigens I wasn’t aware of), it seems to me like there’s no real reason why these therapies couldn’t be developed right now. It just hasn’t been done (yet).
You can probably blame big pharma for not seeing enough of a market in shellfish treatments, as opposed to hay fever which is pretty huge, and just not bothering to pump the necessary millions of funding into it.
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