andyt andyt:
apparently you have to keep on being bitten to have immunity, and it only works for some. I certainly noticed when I spent a lot of time in the woods, mosquitoes stopped bothering me, and I only used deet when they were really bad and I was staying in one place.
I think if you're in such a bad area, and can't/won't leave that area that you eventually stop noticing. I also noticed that mosquito bites in Ontario tend to raise little inflammation but itch for a long time but in western Canada they swell more but stop itching fairly quickly.