On the topic of Giardia:
you become immune in the sense that you may not develop the symptoms again (although you also may develop them, it can take a while for them to disappear completely) but you may still carry the disease, and that's not very good, because you could transmit it to others, unless you have 100% foolproof sanitary conditions at your house and everywhere you go, which is probably not the case for most of us (and thank God for that, in a way).



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