Morphological, molecular and histopathological identification of Sarcoptes scabiei infection in a goat herd at Goa, India
2025
Rajkumar, Susitha
Mange is caused by infestation with mites of different genera which significantly impacts the farm economy by affecting growth and weight gain in kids. This study was carried out to investigate a severe mange outbreak in a goat herd in North Goa District, Goa, and to characterize the causative pathogen. A total of 82 out of the 100 goats were affected. The disease was diagnosed by clinical signs, gross and histopathologic lesions, microscopical detection of mites, and confirmed by PCR and 16s rRNA sequencing, and the genetic characterization of the S. scabiei isolate was carried out. The animals showed pruritus, erythema, papule formation, alopecia, and scab formation, and lesions were mainly distributed on the head around the eyes, lips, nostrils, ears, face, and neck. The KOH digestion method showed the different developmental stages of S. scabiei. Histopathological changes like acanthosis, micropustule formation around degenerating mite, acantholysis and infiltration of inflammatory cells and presence of parasite stages and eggs in the tunnels in the stratum corneum were observed. Treatment using Ivermectin, Chlorpheniramine maleate, Deltamethrin and oral vitamin supplements led to the complete recovery of the affected animals. The phylogenetic study based on 16s rRNA and ITS genes revealed that the Goan isolate was phylogenetically close to wild animal and livestock isolates from Egypt, Australia China, and Europe.
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