Parasites, Hosts and Diseases

The Korea Society for Parasitology and Tropical Medicine (대한기생충학·열대의학회)
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The First Outbreak of Chorioptes texanus (Acari: Psoroptidae) Infestation in a Cattle Farm in Korea

  • Suh, Guk-Hyun (College of Veterinary Medicine, Chonnam National University) ;
  • Hur, Tai-Young (Dairy Cattle Research Division, National Institute of Animal Science, RDA) ;
  • Lim, Sun (Biotherapy Human Resources Center, College of Veterinary Medicine, Chonnam National University) ;
  • Shin, Sang-Min (Biosafety Research Institute, College of Veterinary Medicine, Chonbuk National University) ;
  • Kwon, Jung-Kee (Biosafety Research Institute, College of Veterinary Medicine, Chonbuk National University) ;
  • Cho, Shin-Hyeong (Department of Malaria and Parasitic Diseases, National Institute of Health) ;
  • Lee, Chai-Yong (College of Veterinary Medicine, Chonnam National University) ;
  • Shin, Sung-Shik (College of Veterinary Medicine, Chonnam National University)
  • Published : 2008.12.31
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Abstract

Mites in the genus Chorioptes cause a mild form of skin disease in both domestic and wild ruminants. In July 2006, dermatitis characterized by alopecia, marked lichenification, accumulation of crust, and fissuring was recognized in 14 out of 200 Holstein dairy cattle raised in the cattle farm of the National Institute of Animal Science in Cheonan, Republic of Korea. Skin lesions were distributed mainly over the tail base, and sacral and perineal regions. Microscopic examinations of skin scraping samples from severely affected areas revealed numerous mites of all developmental stages. Morphologically, pedicels of the mites were short and unjointed. The tarsal suckers occurred on the pedicels of all the legs in the male worm and on the first, second, and fourth pair of legs in the adult female worm. A single long seta at the tarsus of legs III and the length of legs II being about twice as long as legs IV in adult male mites were observed. Arising anterior to the inner-most spatulate seta was a short seta with an average of $26.4{\pm}5.8{\mu}m$ in length. Also, the length of setae #4 on the opisthosomal lobes was relatively short. Based on these observations, the mites were identified as Choriptes texanus. Although the chorioptic mange may not influence the mortality rate in the affected farm, reports indicate that a decline in milk production can be observed. This is the first report of chorioptic infestation in a cattle farm from Korea.

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References

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