Veterinary parasitology, regional studies and reports · 2025
Unravelling the role of Calliphoridae (Insecta: Diptera) as a causative agent of myiasis in sheep with Chrysomya megacephala (Fabricius) as the first documented agent of myiasis in ruminants from Kashmir Himalaya, India.
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Dar Tanveer Ahmad, Mir Altaf Hussain
Аннотация
PURPOSE: Calliphorid flies commonly cause traumatic myiasis in sheep, which refers to the parasitic infestation by fly larvae in living vertebrate tissues and hence poses a great threat to the well-being of vertebrates. In the present study, surveys were carried out in different regions of the Kashmir Himalaya to document the incidence and prevalence caused by myiasis in sheep.
METHODS: Seasonal surveys were conducted at the selected study locations, especially in the areas with a high density of nomadic herding. The wounds of the sheep were examined for the presence of calliphorid larvae. The fly larvae associated with myiasis were collected from the infested regions with the help of a brush and forceps and preserved in 90 % ethanol for laboratory studies.
RESULTS: During the present study, a total of 6441 sheep were screened for the infestation of calliphorids (blowflies) out of which 220 were found harbouring the fly larvae. The ewes (79.09 %) were found more susceptible than males (20.90 %). The incidence and prevalence of myiasis in sheep showed seasonal specificity, with the highest rate in autumn followed by summer, whereas no case of myiasis was recorded in spring and winter. The larvae causing this condition were identified as 3rd instar larvae of Chrysomya megacephala (Fabricius, 1794) and Lucilia sericata (Meigen, 1826). Chrysomya megacephala (Fabricius) has been documented for the first time in India as the causative agent of myiasis in sheep. Predictable mortality rate among the seasons and selected sites was also investigated.
CONCLUSION: The present work is one of the first kind of studies from Kashmir Himalaya compiling information on myiasis-causing flies in sheep, particularly those in the Calliphoridae, and this study will act as a roadmap for further studies on the issue and its management.
METHODS: Seasonal surveys were conducted at the selected study locations, especially in the areas with a high density of nomadic herding. The wounds of the sheep were examined for the presence of calliphorid larvae. The fly larvae associated with myiasis were collected from the infested regions with the help of a brush and forceps and preserved in 90 % ethanol for laboratory studies.
RESULTS: During the present study, a total of 6441 sheep were screened for the infestation of calliphorids (blowflies) out of which 220 were found harbouring the fly larvae. The ewes (79.09 %) were found more susceptible than males (20.90 %). The incidence and prevalence of myiasis in sheep showed seasonal specificity, with the highest rate in autumn followed by summer, whereas no case of myiasis was recorded in spring and winter. The larvae causing this condition were identified as 3rd instar larvae of Chrysomya megacephala (Fabricius, 1794) and Lucilia sericata (Meigen, 1826). Chrysomya megacephala (Fabricius) has been documented for the first time in India as the causative agent of myiasis in sheep. Predictable mortality rate among the seasons and selected sites was also investigated.
CONCLUSION: The present work is one of the first kind of studies from Kashmir Himalaya compiling information on myiasis-causing flies in sheep, particularly those in the Calliphoridae, and this study will act as a roadmap for further studies on the issue and its management.