Helminthiases / / August 12, 2017
Diseases caused by flies and oestriasis
myiasis - diseases caused by penetration into the body of humans and animals the larvae of some flies.As larvae myiasis localization distinguish tissue, abdominal and mixed in their lifestyle - casual, facultative and obligate.
myiasis Intestinal myiasis. arise if accidentally swallowed small newborn larvae of flies, which in cases of reduced gastric acidity penetrate living in the intestine, where they can develop even more.It is assumed that this is possible in individuals who are prone to aerofagii as for the development of larvae need oxygen.When intestinal myiasis there is irritation and inflammation of the mucous membrane of the gastrointestinal tract.Patients complain of abdominal pain, nausea, vomiting, frequent stools.Larvae in the feces stand out, at least - with vomiting.Activators are intestinal myiasis larvae room, house, gray, green and blue meat flies and fruit flies and cheese fly.
urinary myiasis. Indoor and others sometimes flies
Prevention. necessary to combat the flies, to protect them from the foods comply with the measures of social and personal hygiene.The water from open reservoirs, you should drink only after boiling and filtering.
Green and blue blowflies usually lay their eggs in the bodies of animals and meat waste, room and house flies - in the feces of man, rotting vegetable matter, manure, gray blowfly - in feces and sometimes in human food.The flies can lay eggs and larvae in human wounds, suppurating ears and nose.Normally, the larvae do not cause harm, and even contribute to the healing of wounds by eating pus and releasing bactericides.At one time, the so-called surgical larvae of flies (Calliphora et al.) Were used in the treatment of wounds and osteomyelitis.However, with the larvae taken from their habitats in the wound is sometimes recorded pathogens tetanus and gas gangrene.In the future, we began to receive sterile larvae of blue blowflies.Now these therapies in surgical practice do not apply and larvae caught in the human body are removed with tweezers or by washing.
obligate myiasis are caused by fly larvae that can develop only when the parasite in the body of humans and animals.Distinguish myiasis malignant and benign.
Malignant myiasis caused by larvae mainly volfartovoy flies (Wohlfahrtia magnibica), common in southern Europe, Arab Republic of Egypt, Mongolia, China, the Caucasus, Central Asia, Kazakhstan, the central and southern zones of Russia.
fly lays on the skin of humans and animals 120-160 very mobile larvae about 1 mm long.They quickly penetrate the skin deep into the tissues of the flesh to the bone, moving eyes, nose, ears, and even the brain, providing a mechanical tissue allergoidnoe and enzymatic effects.In humans, the larvae infested volfartovoy flies emerge necrosis and suppuration occur extensive damage tissues and organs.Cases of complete destruction of the larvae of the eyeball, the destruction of the integument of the head, under their influence occurrence of osteomyelitis, encephalitis, severe lesions of female genital mutilation.Known deaths.The disease progresses with extraordinary rapidity.
volfartovoy flies larvae develop very quickly: after 3-5 days they become mature, leaving the host and pupate in the soil.
Diagnosis is made upon detection of fly larvae.When parasitizing them in the depth of tissue is often noticeable stir.
Treatment of malignant myiasis is washing the wound with water or irrigation chloroform chloroform solution in vegetable oil, removing tweezers euthanized larvae, the elimination of necrotic tissue, the opening of abscesses, the use of antimicrobial drugs, the introduction of tetanus toxoid.
Wohlfahrtia Magnifica lays larvae mainly on ungulates.Of great importance for the prevention of malignant myiasis and control are periodic inspections of farm animals (sheep, etc.), Removing them from the larvae of flies.
Benign myiasis caused by larvae developing individually and slowly.There are African and South American myiasis.
African myiasis caused by fly Cordylobia anthropophaga, lays about 500 eggs in the sandy soil, preferably soaked in urine.Hatched larvae actively take root in the human skin, lying on the sand or walking barefoot.The larvae are parasitic in the body of rats, cats, dogs, monkeys and others.
On-site implementation of larval skin infiltration occurs, similar to the boil and covered with a crust, under which there is a cavity with a larva.After 12-15 days, the larva reaches a length of 12-17 mm, comes out of the skin falls to the ground and pupate there.
Treatment is carried out by irrigation water infiltration or flooding it with vaseline oil.Due to the lack of air larvae protrude rear part of the body.This makes it possible to remove them with tweezers, then the recovery occurs quickly.
Prevention. Rodent, wearing shoes, the extermination of flies, health improvement beaches.Do not lie on the sand without litter.
myiasis Copa Sudamericana
myiasis is found in Mexico, Argentina and other countries in Central and South America.Pathogen - maggot Dermatobia hominis.The female fly lays eggs on the body of mosquitoes, flies, ticks and several lighters.After 6 days in the eggs forms the larvae, but they leave only shell eggs at planting insects and mites, which are found on humans or animals (cattle, pigs, etc.).The larvae penetrate the skin quickly, which grow slowly and develop.After 5-10 weeks they reach 25 mm in length, and fall to the ground to pupate.
About intruded larvae infiltration occurs with a hole, from which it follows seropurulent liquid.The lesions are located mainly on the limbs, back, stomach, armpits.A case of death of a child 1.5 years with multiple invasive larvae of flies.
Treatment carried extracting forceps larvae.
Prevention held through a planned survey of domestic ungulates and treatment of patients, anti-blood-sucking insects and mites by repellents.
myiasis caused by the larvae of gadflies
Distinguish myiasis abdominaland skin.
Coelomic cause myiasis larvae Russian sheep gadfly (Rhinoestrum purpureus and Oestrus ovis).Females of these gadflies on the fly larvae in the nostrils emit horses and sheep, at least - in the eyes and even less - in the human nose.There are outdoor oftalmomiaz when larvae penetrate only the eyelids, lacrimal sac and conjunctiva, and internal - in implementing them in the internal environment of the eye.There are conjunctivitis, dacryocystitis.Possible blindness.The larvae are very mobile in the eye, so the eye initially anesthetized and only then removed with tweezers or by washing with water, the larvae.With the penetration of larvae of Russian and sheep gadfly nose rhinitis occurs with abundant secretions, there is a constant headache.Treatment consists in extracting larvae.
Cutaneous myiasis larvae cause gastric gadfly horse (Gastrophilus intestinalis) and skin gadfly of cattle (Hypoderma bovis, H. lineata).
female gadfly horse egg sticks to the wool horse, sometimes a human hair.A person can take them and in contact with the horse.Released from the egg larvae embedded in the epidermis and migrate into it, producing mechanical and enzymatic effect on the fabric.During the day she is moving 0.5-30 cm, paving the skin in a linear course, from the outside looked like a scratch.This gives rise to itching and burning.The treatment is to remove the larvae after opening formed its stroke end.Larvae of the first and second stage of gastric gadflies are parasitic in the stomach and occasionally horse person.
Skin tics cattle (H. bovis and H. lineata) is adhered to the eggs one by one animal fur or human hair.Hatched from their larvae penetrate the skin and migrate there.After a few months under the skin around them is formed "tumor" with an opening through which the larva emerges.The larvae of the first stage of H. bovis in the host is required to migrate through the spinal canal, penetrating into it in the course of nerves.Hence, through the intervertebral holes they move under the skin.Cases of skin penetration of larvae of gadflies in the anterior chamber of the eye and eyelid.
Treatment of cutaneous myiasis is performed by surgical removal of the larvae.