Fly and mosquito allergies: can the bites from them cause fevers?

Insect bite allergy. Insect bite allergy does not cause fever. However insects can act as vector to carry different pathogens and can transmit those when it bite you. Several diseases can be caused by insect bite can make you have a fever e.g. Dengue fever, malaria, west nile encephalitis... Fly can carry bacteria and cause diarrhea.