Mosquitoes don't actually "target" tourists, but they often seem to because of "immunological novelty" and local adaptation. Locals in tropical regions often have a level of "desensitization" to the local mosquito saliva; while they are still being bitten, they don't itch or swell as noticeably as a fresh tourist. Furthermore, tourists often engage in high-attraction behaviors: they may use scented soaps or perfumes that act as beacons, or their bodies may be slightly warmer and release more carbon dioxide due to the exertion of walking and exploring in a new climate. In 2026, research also suggests that "dietary changes" (like the consumption of alcohol or specific foods on vacation) can temporarily alter skin chemistry, making a visitor a "mosquito magnet." The high-value defense is using a DEET or Picaridin-based repellent and wearing light-colored, long-sleeved clothing, as mosquitoes are visually attracted to dark, high-contrast shapes.