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Fly maggot disease is a disease caused by the larvae ---- maggots of flies parasitized on the human or animal body. It is a general term for diseases caused by the larvae of parasitic flies of the insect order (Insecta) Diptera (Diptera) infesting domestic animals. Harmful mainly stomach fly maggot disease, skin fly maggot disease and nose fly maggot disease. It is common in pastoral areas. According to the data, Cordylobia Anthropophaga, also known as Cordylobia Anthropophaga, causes dermatophytosis. Cordylobia Anthropophaga larvae, which are widespread in Africa, form boil-like lumps after burrowing into human skin areas. However, it is different from the common dermatophagoides and tauropod flies in that it does not migrate, whereas dermatophagoides and tauropod flies migrate under the skin, and sometimes to deeper tissues and organs such as the thorax, the abdomen, the eyes, and the brain.

Dr. Yeung Keung Chung, a chartered laboratory technician, pointed out that the fly maggot parasite likes to build its nest on underwear that is not washed well. The first time I've seen this, I've seen it in my own life," he said. The body of the adult parasitic fly is divided into three parts: head, thorax and abdomen. The thorax has 3 pairs of limbs and 1 pair of forewings, and the hindwings degenerate into a balance body. The terminal appendages of the abdomen become external genitalia. The larvae, commonly called maggots, have no head, no wings, and no limbs. The whole body generally has 12 to 13 segments, but is still divided into head, thorax and abdomen, the first segment is the pseudohead, the next three segments are thoracic segments, and the last 8 to 9 segments are abdominal segments. The dorsal and ventral surfaces of the segments are often covered with many small spines, whose size, number and position are of discriminatory significance. Complete metamorphosis. In addition to the fetal mad fly, generally have to go through the egg, larva, pupa and adult 4 stages. Male flies die after mating; female flies die after producing eggs or larvae, and their lifespan generally does not exceed 1 month. During the egg-laying period, neither foraging, nor biting livestock. The entire development cycle is about 1 year.

The larvae of flies such as the horse stomach fly (which can cause gastric maggot disease in horses); the sheep mad fly (which causes nasal maggot disease in sheep); the cowhide fly and the cow tattoo fly (which causes cowhide maggot disease); and the spiral trypanosome fly (which parasitizes wounds in animals and humans) are specialized parasites. Their larvae cannot survive or continue to grow and develop without a host.

The vast majority of fly maggots are free-living, but some species of fly maggots may still enter the animal body and human parasitism once the opportunity arises, which is called parthenogenetic parasitism.

In addition to parasitic fly maggots parasitized on large animals, there are also parasitic fly species parasitized on insects that cause fly maggot disease, such as silkworm maggot disease. Adults lay their eggs on the surface of the silkworm body, and after hatching, the maggots pass through the body wall of the silkworm into the body cavity to feed on the fat of the silkworm and secrete endohormones to control the behavior and growth of the silkworm. To wait for the host cocoon after drilling out the host body wall, the host then died, the fly maggots in the cocoon pupa feathering. Silkworm maggot disease is a serious danger to silk farming disease. The outbreak of the epidemic will cause serious losses to sericulturists.

The main symptom of fly maggot disease is manifested in the mechanical irritation of the fly maggot on the host or patient. The hairs, hooks, spines, and migrations on the body surface of the fly maggot irritate the body wall of the host. The patient may feel stinging, pain, itchiness, foreign body sensation, migratory sensation, etc. in certain parts of the body. For example, patients with nasal maggots may sneeze and feel a foreign body sensation in the nose. Genitourinary fly maggots may feel tingling, migrating, frequent, urgent and painful urination in the lower abdomen, urethra and vagina. Dermatophagoides patients will feel subcutaneous cone pain, subcutaneous migratory sensation, and even subcutaneous tunnels can be seen after the fly maggots migrate. In addition, fly maggots carry bacteria on their body surface, which may cause infection. In nasal maggots, the maggots may enter the cranial cavity through the sinuses, causing serious consequences and even death. Fly maggots that cause ocular fly maggots may enter the interior of the eye, destroying the tissues inside the eye and causing blindness. Some fly maggots feed on host body tissues, such as those of Trypanosoma spiralis. The consequences can be severe, even death.

According to Professor Zeng Anti, director of the Department of Dermatology at the Southern Hospital, skin fly maggot disease was originally a parasitic disease of livestock such as cows, horses, etc., and it can also be infected in humans. Fly maggots directly lay eggs on human skin or hair, clothing, when the eggs hatch into larvae, can be drilled into the skin, causing skin fly maggot disease. This disease is mostly seen in pastoral areas, China's Qinghai, Tibet, Inner Mongolia, Northeast and North China and other places have reported, and in Guangdong and other developed coastal areas of this disease is rare. Prevention of skin fly maggot disease is mainly concerned about environmental hygiene and personal hygiene, regular fly work, if you feel unwell, should promptly go to the dermatology department of a large hospital, so as not to delay treatment. [2] If you are in a position to do so, you can check and sterilize your clothes regularly, just in case.

(1) Runner's rash When the fly maggots pass through the skin and migrate in the subcutaneous tissue, a red edematous bulge appears on the skin, and the larvae are hidden in the normal skin at the front of the blisters.

(2) boils appear on the skin in the initial incidence of varying sizes, varying shades of nodules or lumps, accompanied by pain and pressure, the fly maggots live in the nodules, when the larvae are about to drill out of the skin, the lumps gradually increase in size, the local edema intensified, the skin pores dilated, with a cone-like pain and the feeling of worms wriggling, a few hours later, the surface of the lumps or nodules appeared soybean-sized blisters, blisters wall is thin and tense, if you puncture the blister wall can be from the yellowish, the blisters can be seen on the surface of the skin. If the wall of the blister is pierced, the larvae can be squeezed out from the yellow-red mucus, and then the lump shrinks and the inflammation subsides, leaving a small hole in the center and healing. In rare cases, the nodules may take several months to break down if the fly maggots are very deep in the area of parasitization. If the nodules do not break, the fly maggots can sneak under the skin for several centimeters and then reappear as new nodules or lumps, and small pimples appear on the surface of the lumps to form pseudo-abscesses, which is known as variolous cutaneous fly maggot disease. Boils of cutaneous fly maggots occur in the loose parts of the skin, mostly on the eyelids, lips, abdomen, forearms deep, the number of 1 to 2 or up to 10 or more.

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