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<p>In this study, we conducted an epidemiological investigation and analyzed the agreement between the Faust technique and the immunochromatographic assay in the diagnosis of <i>Giardia</i> spp. in 272 cats in the municipality of Londrina, Paraná state, Brazil. We identified an overall prevalence of 74.63% (203/272 [95% CI: 69.14–79.44%]) of <i>Giardia</i> spp. in cats, being significantly higher in adult and non-domiciled animals, which presented, respectively, 5.3 and 8.6 times more chances of infection when compared to kittens and domiciled animals. However, all the animals investigated that tested positive did not present with diarrhea. Regarding diagnostic methods, using coproparasitological examination, <i>Giardia</i> spp. cysts were observed in the feces of 193 cats, and through the immunochromatographic assay, coproantigens of this protozoan were detected in 203 samples, demonstrating almost perfect agreement (<i>Kappa</i> Cohen: 0.907). Thus, according to the authors’ knowledge, this is the highest prevalence of <i>Giardia</i> spp. ever identified in cats in Brazil, and with regard to diagnostic methods, we observed a high concordance between the coproparasitological examination and the immunochromatographic assay in the detection of the aforementioned protozoan.</p>

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High prevalence of Giardia spp. in cats without diarrhea and agreement between diagnostic techniques in the municipality of Londrina, Paraná, Brazil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Luiz Roberto Santos Aoki,
  • Fernando de Souza Rodrigues,
  • Giovanna Cristina Justino Santos Aoki,
  • Lethicia Mendes Nino,
  • Mateus Siqueira Pyles,
  • Michel dos Santos Pinto,
  • Michelle Santos Sabioni,
  • João Alfredo Biagi Camargo Neto,
  • Alex Akira Nakamura,
  • Katia Denise Saraiva Bresciani,
  • Gustavo Felippelli,
  • Marcos Franke Pinto

摘要

In this study, we conducted an epidemiological investigation and analyzed the agreement between the Faust technique and the immunochromatographic assay in the diagnosis of Giardia spp. in 272 cats in the municipality of Londrina, Paraná state, Brazil. We identified an overall prevalence of 74.63% (203/272 [95% CI: 69.14–79.44%]) of Giardia spp. in cats, being significantly higher in adult and non-domiciled animals, which presented, respectively, 5.3 and 8.6 times more chances of infection when compared to kittens and domiciled animals. However, all the animals investigated that tested positive did not present with diarrhea. Regarding diagnostic methods, using coproparasitological examination, Giardia spp. cysts were observed in the feces of 193 cats, and through the immunochromatographic assay, coproantigens of this protozoan were detected in 203 samples, demonstrating almost perfect agreement (Kappa Cohen: 0.907). Thus, according to the authors’ knowledge, this is the highest prevalence of Giardia spp. ever identified in cats in Brazil, and with regard to diagnostic methods, we observed a high concordance between the coproparasitological examination and the immunochromatographic assay in the detection of the aforementioned protozoan.