ABSTRACT
Sarcoptic mange or scabies is a contagious parasitic skin disease that affects a wide range of domestic and wildlife species. A cross-sectional study was carried out to determine the prevalence, molecular identification, and characteristics of sarcoptic mange in vicuñas. A total of 3,274 vicuñas were examined. Following ritual harvesting events ("chaccus") in 13 Andean communities. The presence of mange mites was determined by the skin scraping technique and confirmed by PCR analysis using specific primers for the ITS2 gene of Sarcoptes scabiei. The presence of mange mites was also confirmed by microscopy using samples taken from wallows. A data collection form was used to register the characteristics of the vicuñas sampled. The prevalence of sarcoptic mange was 4.9% (95% CI: 4.1 - 5.6%). All samples from wallows tested positive (9/9). Importantly, the presence of the species S. scabiei was molecularly confirmed. Adult females with regular body condition were more susceptible to sarcoptic mange, although the lesions were mild. This study confirms the presence of S. scabiei in semi-captive vicuñas and points to the possible role of wallows in the dissemination of Sarcoptes mites.
Subject(s)
Sarcoptes scabiei , Scabies , Scabies/epidemiology , Scabies/veterinary , Cross-Sectional Studies , Animals , Peru/epidemiology , Female , Male , Prevalence , Sarcoptes scabiei/geneticsABSTRACT
Abstract Sarcoptic mange or scabies is a contagious parasitic skin disease that affects a wide range of domestic and wildlife species. A cross-sectional study was carried out to determine the prevalence, molecular identification, and characteristics of sarcoptic mange in vicuñas. A total of 3,274 vicuñas were examined. Following ritual harvesting events ("chaccus") in 13 Andean communities. The presence of mange mites was determined by the skin scraping technique and confirmed by PCR analysis using specific primers for the ITS2 gene of Sarcoptes scabiei. The presence of mange mites was also confirmed by microscopy using samples taken from wallows. A data collection form was used to register the characteristics of the vicuñas sampled. The prevalence of sarcoptic mange was 4.9% (95% CI: 4.1 - 5.6%). All samples from wallows tested positive (9/9). Importantly, the presence of the species S. scabiei was molecularly confirmed. Adult females with regular body condition were more susceptible to sarcoptic mange, although the lesions were mild. This study confirms the presence of S. scabiei in semi-captive vicuñas and points to the possible role of wallows in the dissemination of Sarcoptes mites.
Resumo A sarna sarcóptica é uma doença parasitária contagiosa da pele que afeta uma ampla gama de espécies domésticas e selvagens. Um estudo transversal foi realizado para determinar a prevalência, identificação molecular e características da sarna sarcóptica em vicunhas. Foram avaliadas 3.274 vicunhas, capturadas durante o "Chaccus", em 13 comunidades rurais alto andinas do Peru. A presença do ácaro da sarna foi determinada pelo raspado de pele e confirmada pela técnica de PCR, com iniciadores específicos para o gene ITS2 de Sarcoptes scabiei e por microscopia nos chafurdeiros. Foi preenchida uma ficha de coleta de dados com as características das vicunhas analisadas. A prevalência de sarna sarcóptica em vicunhas foi de 4,9% (95% IC: 4,1 - 5,6%). Todas as amostras de chafurda testadas (9/9) foram positivas, e a presença de S. scabiei foi confirmada molecularmente. Fêmeas adultas com condições corporais regulares foram mais suscetíveis à sarna sarcóptica, embora as lesões fossem leves. O estudo confirma a presença de S. scabiei em vicunhas em semicativeiro de comunidades camponesas alto andinas do Peru que sofrem de sarna. Destaca-se, ainda, o papel das chafurdas das vicunhas na disseminação da sarna.