Thanks mate. Very interesting. Some obvious, some I hadn't thought about.
I was sure I'd seen a documentary one time about some guy who did a lot of field research in the Amazon, and he's developed an immunity to mozzie bites. They still bit him, but his skin didn't react with the traditional mozzie bite type bump and hence didn't irritate him any more. Lucky bugger. (The documentary wasn't about his mozzie immunity, that was just a side trivia, it was about insects in the Amazon or something)
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