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Superficial skin miases: causes, symptoms, diagnosis, treatment
Last reviewed: 23.04.2024
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N overhnostnye dermamiasis (myasis cutis syperficialis) caused mostly blue blowfly larvae (Sem. Calliphora erythocephalei Meig), spring blowfly (Sem. Calliphora vomitoria L., Profophermia terraenovae RD ), green padalnyh flies (Sem. Lucilia caesar), gray fading flies (family Coprosarcophaga naemorrhoidalis Fall), cheese flies (Piophila casei family) and even house flies (Musca domastica), house flies (Muscina stabulaus), etc.
These flies, attracted by putrefactive odors of decaying tissues, lay eggs in ulcers, suppurating wounds, abrasions, nails, scratches and other violations of the integrity of the skin and mucous membranes, including the nose, eyes, folds in the genital area. Hatching eggs usually in an extremely large number of larvae often infect the whole lesion. Especially a lot of them are under the overhanging edges of ulcers. Objectively, lesions of gray-white islands are visible in the lesion, consisting of crooked semolina grains.
Parasitization of larvae in the wound usually does not cause any special disturbance to the patient. Only some of them indicate the possibility of a feeling of mild itching or "crawling crawling." Diseases of superficial skin miases are relatively benign in nature. This is due to the fact that larvae, not being able to digest living, i.e., normal tissue, are limited only to the devouring of pus and decayed necrotic tissues. Then, at the end of the cycle of their development, these larvae disappear from the skin, and their pupation takes place outside the human body.
Along with the described benign surface miasis, in some cases, the heavier course of it is possible. This is most often observed with common purulent processes in the conjunctiva of the eyes, the nasal mucosa, and the ears. Cases of larvae of houseflies in the urethra and the development of the miass of the urogenital organs are known - myasis urogenitalis. In this case, the larvae can be crammed into the urethra as if eggs fall on dirty bedding, from which the hatching larvae can then penetrate into the urethra, and after the larvae directly migrate from the folds of the external genital organs to the urethra.
In addition to urogenital miases under appropriate conditions, in particular, the ingestion by human larvae of some of the above flies and, for example, having a low acidity of the gastric juice, the development of an intestinal miase, myasis intestinalis, is possible. In these cases, patients note the following symptoms : pain in the intestines accompanied by tenesmus, as well as frequent loose stools. The disease is usually acute, although in some cases, especially with repeated infections, there may be a longer, prolonged course. In this case, with liquid excrements, patients can excrete live larvae. Isolation of larvae to the outside can occur with vomiting.
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