HIV is not spread through the air, and it does not live long outside the body.
HIV is not spread by day-to-day contact in the workplace, schools, or social settings. HIV is not spread through shaking hands, hugging, or a casual kiss. You cannot become infected from a toilet seat, a drinking fountain, a door knob, dishes, drinking glasses, food, cigarettes, pets, or insects.
HIV is not spread through saliva, and there is no documented case of transmission from an HIV-infected person spitting on another person. There is no risk of transmission from scratching because there is no transfer of body fluids between people.
There is no evidence of HIV transmission from mosquitoes or any other insects--even in areas where there are many cases of HIV and large populations of mosquitoes. Unlike diseases that are transmitted by insect bites, HIV does not reproduce (and does not survive) in insects.