Well, the only way you can positvely avoid mosquito bites is to never go outside in the summer time.
In the US, just about the only way you're going to die from a mosquito bite is if you're bitten by a specific type of mosquito that is carrying Yellow Fever or malaria. Fortunately, most of those types of mosquitos have been eradicated from the US. They were prevalent during the 1800's, and today most of their breeding sites (swamps and marshy areas) have been drained and no longer exist.
1000's of people in the summer months in the US are bitten by common mosquitos every day, and the worst thing they suffer is itching at the site of the bite. for a few hours.
If you're still worried, your doctor can vaccinate you against Yellow Fever and malaria, if you ask him to.