title: Re-emergence of Chorioptes bovis (Acari: Psoroptidae) in cattle in the state of Rio Grande do Sul, Brazil.
abstract: Here we describe an outbreak of chorioptic mange in cattle, 56 years after its first identification in Brazil. Between the months of June and July 2011, dermatitis characterized by alopecia and crusted and thickened skin at the insertion of the tail and in the ischiorectal fossa was recognized in 40 (35.7%) out of 112 Holstein cows on a farm in the northeastern mesoregion of the state of Rio Grande do Sul, Brazil. After diagnosing mange caused by Chorioptes bovis, the cows were weighed and treated with 0.5% ivermectin, as a pour-on single dose, and were separated into two groups: cows in early lactation and those in late lactation. The survival rate of C. bovis and the healing rate in the two groups of infested cows were monitored every seven days through skin scrapings. After 28 days of evaluation, the cure rate through treatment was greater among cows in early lactation (p <0.0001). The survival rate of C. bovis was higher in cows in late lactation.
authors.affiliation: Veterinary Parasitology Laboratory, School of Agronomy and Veterinary Medicine - FAMV, University of Passo Fundo - UPF, Passo Fundo, RS, Brazil.
authors.forename: Maria Isabel Botelho
authors.initials: MI
authors.lastname: Vieira
authors.affiliation: Veterinary Endocrinology, Integrated School - AVM, Rio de Janeiro, RJ, Brazil.
authors.forename: Tiago
authors.initials: T
authors.lastname: Bordin
authors.affiliation: Molecular and Cell Biology, Pontifical Catholic University of Rio Grande do Sul - PUCRS, Porto Alegre, RS, Brazil.
authors.forename: Bruno
authors.initials: B
authors.lastname: Dall'Agnol
authors.affiliation: Veterinary Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre, RS, Brazil.
authors.forename: Fabiane
authors.initials: F
authors.lastname: Zanchin
authors.affiliation: Animal Pathology Laboratory, School of Agronomy and Veterinary Medicine - FAMV, University of Passo Fundo - UPF, Passo Fundo, RS, Brazil.
authors.forename: Adriana Costa Da
authors.initials: AC
authors.lastname: Motta
authors.affiliation: Federal University of the Pampa - UNIPAMPA, Uruguaiana, RS, Brazil.
authors.forename: Mirela
authors.initials: M
authors.lastname: Noro
mesh_terms: D000818:Animals; D001938:Brazil / Q000453:epidemiology; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000469:parasitology*; D021821:Communicable Diseases, Emerging / Q000453:epidemiology / Q000662:veterinary*; D004196:Disease Outbreaks / Q000662:veterinary*; D005260:Female; D008924:Mite Infestations / Q000453:epidemiology / Q000662:veterinary*; D040042:Psoroptidae