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Laboratory diagnosis of mange-causing mites in dogs using a modified centrifugation-flotation technique in sucrose solution
Authors:Alvares  Felipe Boniedj Ventura  Meireles  Vivian Silva Rosa Veleda  da Silva  Juliana Trajano  Ferreira  Larissa Claudino  Rodrigues  Jossiara Abrante  Bezerra  Roberto Alves  Lima  Brendo Andrade  Feitosa  Thais Ferreira  Vilela  Vinícius Longo Ribeiro
Institution:1.Departamento de Medicina Veterinária do Instituto Federal de Educa??o, Ciência e Tecnologia da Paraíba (IFPB), Sousa, Paraíba, Brazil
;2.Programa de Pós-Gradua??o em Ciência e Saúde Animal, Universidade Federal de Campina Grande (UFCG), Patos, PB, Brazil
;
Abstract:

Among the skin disorders of dogs, scabies is notable for its high occurrence rate and the need for veterinary interventions. There are two obstacles to making this diagnosis through direct investigation under a microscope (DIM): the continual need to make new slides when the results are negative and the long time needed for reading these slides. Thus, the objective of the present study was to compare efficacy between DIM and the technique of centrifugation-flotation in sucrose solution (CFSS) in samples from dogs in the semiarid region of the state of Paraíba, Brazil. Samples from 136 dogs were used, and three slides were made for each examination (DIM and CFSS). The readings were halted in cases of positivity. Positive samples were obtained from 56.6% of the dogs (77/136), of which 76.6% (59/77) were positive through both techniques, 13% (10/77) only through DIM and 10.4% (8/77) only through CFSS. The positivity rate did not differ statistically between the techniques. CFSS showed higher quality of readings, due to the considerably fewer artifacts on the slides, thereby optimizing the reading time. Sensitivity (85.6%), specificity (88.1%), accuracy (86.8%), positive predictive value (88.1%) and negative predictive value (85.1%) were obtained and the kappa coefficient (0.73) was considered substantial. It was concluded that CFSS showed high diagnostic capacity for scabies, similar to that of DIM, with optimized reading time, fewer artifacts and better display of mites.

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