There are more than a thousand species of flies, all of which work to transmit diseases from place to place, which causes the transmission of diseases between humans … The fly moistens a small piece of solid food with the saliva it secretes, turning the solid food into a semi-liquid substance so that it can absorb it, which causes the transmission of many diseases to humans such as intestinal worms, fecal bacteria, viruses and typhoid, in addition to the causes of cholera … If you encounter the presence of flies, contact us.