10/5/2023 0 Comments Fly strike in humans![]() One alternative prevention method is the SIT (Sterile Insect Technique) where a significant number of artificially reared sterilized (usually through irradiation) male flies are introduced. Organophosphorus or organochlorine compounds may be used, usually in a spraying formulation. The principal control method of adult populations of myiasis inducing flies involves insecticide applications in the environment where the target livestock is kept. The second control method is the treatment once the infestation is present, and concerns the infected animals (or humans). The first control method is preventive and aims to eradicate the adult flies before they can cause any damage and is called vector control. They may also be ingested or enter through other body apertures. The adult flies are not parasitic, but when they lay their eggs in open wounds and these hatch into their larval stage (also known as maggots or grubs), the larvae feed on live and/or necrotic tissue, causing myiasis to develop. Other families occasionally involved are: There are three main fly families causing economically important myiasis in livestock and also, occasionally, in humans: Thus the myiasis is described as either obligatory or facultative or accidental. ![]() Another classification is based on the relationship between the host and the parasite and provides insight into the biology of the fly species causing the myiasis and its likely effect.For example: dermal, sub-dermal, cutaneous (B87.0), nasopharyngeal (B87.3), ocular (B87.2), intestinal/enteric (B87.8), or urogenital (B87.8). This is the classification used by ICD-10. ![]() The classical classification describes the myiasis by the infected area of the host.Two different classifications of myiasis can be adopted: German entomologist Fritz Zumpt describes myiasis as "the infestation of live human and vertebrate animals with dipterous larvae, which at least for a period, feed on the host's dead or living tissue, liquid body substances, or ingested food." Infestation of vulvar area with larvae and maggots is called Vulvar Myiasis. Blowfly strike accounts for over $170 million a year in losses in the Australian sheep industry and so prevention measures such as mulesing are practiced. This leads to anorexia and weakness and if untreated will lead to death. After about the second day bacterial infection occurs and if left untreated causes toxemia or septicemia. The larvae then tunnel into the host's tissue causing irritating lesions. This results in sores as the larvae lacerate the skin and this is the primary reason for the early removal of lambs' tails. It takes approximately 8 hours to a day for the eggs to hatch, depending on the conditions. ![]() The female flies lay their eggs on the sheep in damp, protected areas soiled with urine and faeces, mainly on the sheep's breech ( buttocks). Colloquialisms for Myiasis include "fly-strike" and "fly-blown".īlowfly strike, known as myiasis, is a common disease in sheep, especially in areas where there are hot and wet conditions. Myiasis is an animal or human disease caused by parasitic dipterous fly larvae feeding on the host's necrotic or living tissue. Myiasis Classification & external resources ICD-10
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