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by simple10 755 days ago
From personal experience, exposure does not lead to lasting immunity. Quite the opposite. I've had several intense exposure rashes that were debilitating, like not being able to walk properly for a week due to leg swelling. And I still get rashes from poison oak.

Maybe there's a bit of short term immunity from severe exposure. I've never tested that since the discomfort from an intense rash makes me avoid exposure like the plague for a few years.