ENTO 301 discusses medical and veterinary entomology. Major insect orders that impact human and animal health include Diptera, Hemiptera, Phthiraptera, and Siphonaptera. These insects transmit diseases, inject venoms, cause allergic reactions and phobias, and create nuisances. Important disease vectors discussed include mosquitoes, black flies, sand flies, biting midges, horse flies, tsetse flies, and house flies. Many of these insects transmit pathogens like viruses, bacteria, protozoa and filarial worms.