Why are flies and mosquitoes harmful?

Flies can spread many germs to people and make people sick, which is well known.
There are many diseases transmitted by flies, including enteritis, dysentery, typhoid fever, cholera and so on. But why can flies spread disease?

First of all, it starts with the living habits of flies. Flies like to eat a lot of things, including all kinds of sweets, rotten melons and fruits, pus and blood on animal corpses and wounds, phlegm on the ground, etc. they especially like to eat human and animal feces. Therefore, flies have a wide range of recipes, almost all kinds of clean and dirty things, which can be used to satisfy their hunger.
The mouth of an insect is called a mouthpiece. The mouthparts of flies are licking and sucking. When flies eat, they often spit out a liquid first, dissolve the dry food, and then lick it. Flies are extremely greedy animals. When they are full, they often spit out some food that has been eaten into their stomach. And the fly has the habit of defecating everywhere, pulling while eating, and discharging its feces on the food it is eating at any time. In addition, flies have many hairs on their bodies and legs, like small brushes. When it stays on dirty things, it is easy to stick a lot of germs. There are more than 6 million bacteria on a fly..

Mosquitoes mainly spread malaria and epidemic encephalitis B. When Anopheles mosquitoes feed on the blood of patients with malaria, they also suck the Plasmodium into their bodies. When they bite again, the malaria parasite is injected into the bitten person from the mosquito’s mouth. Ten days later, the malaria parasite began to appear in blood vessels close to the skin. They reproduce in the patient’s red blood cells and divide into a large number of small Plasmodium. These small Plasmodium destroy the red blood cells and release a toxin. Each small malaria parasite invades other red blood cells and continues to reproduce, causing more and more malaria parasites and toxins in the diseased body, causing the patient to get cold and fever. The patient with malaria first gets cold and shakes all over, but the temperature measured by the thermometer is high. After about an hour, the patient felt feverish. At this time, his body temperature continued to rise. After three or four hours, he began to sweat and his body temperature fell. After a few hours, the patient felt relaxed and the disease seemed to be over. In fact, at this time, the small Plasmodium falciparum had invaded new red blood cells and began to reproduce again. When the malaria parasite destroys red blood cells again, the patient will get sick again.
Mosquito borne encephalitis B is more harmful to the body and can be life-threatening in serious cases.

Speaking of this, you see, flies and mosquitoes are really big pests.

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