Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Insect Bites and Stings ?
    ### Response:
    Most insect bites are harmless, though they sometimes cause discomfort. Bee, wasp, and hornet stings and fire ant bites usually hurt. Mosquito and flea bites usually itch. Insects can also spread diseases. In the United States, some mosquitoes spread West Nile virus.
    