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Our bodies generate heat, and the levels of water vapor close to our skin can vary depending on the surrounding temperature.
As a mosquito gets closer to us, it can detect heat and water vapor. This can play a role in whether it decides to bite. One study found that mosquitoes move toward nearby heat sources that are at a desired temperature.
These factors can also be important for host selection. Other animals may have differences in body temperature or water vapor throughout their bodies. These variations could be unattractive to mosquitoes that prefer to feed on humans.
By: healthline
