Comparison between diagnostic methods of Cryptosporidium spp. in fecal samples from cattle
Keywords:
Cryptosporidiosis, parasitological diagnosis, protozoa, auramina colorationAbstract
Cryptosporidiosis is an enteric disease with varied clinical manifestations and eventual mortality, mainly in young animals, causing impairment in development. This study aimed to compare staining techniques for the detection of Cryptosporidium spp. oocysts in dairy calf feces from 22 municipalities of the southern region of Rio Grande do Sul, Brazil. Fecal samples were collected directly from the rectum of 359 calves of different breeds, male and female, up to twelve months old. Cryptosporidium spp. oocysts were observed using the colorimetric methods of Kinyoun, Safranina and Ziehl-Neelsen and were visualized under optical microscopy and by fluorescence with auramine stain. Cryptosporidium spp. oocysts were observed in 6.69% (24/359) of the analyzed samples. From these results it can be inferred that the four colorimetric methods were effective in the detection of Cryptosporidium spp., being able to reveal this parasite even in samples
with a reduced number of oocysts. There was no statistically significant difference between the methods for diagnosis, even though, the Auramine staining fluorescence method presented the best result in comparison with the colorimetric techniques used in this study.
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