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[–][deleted] 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (1 child)

Yeah. Pretty interesting how there is a fine line between being exposed to the right amount of disease to build a solid immunity, and full on catching a contagious disease.

[–]magnora7 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

It does seem like a pretty thin line, but maybe it's not as thin as we think. It's certainly an interesting subject.