RESUMO
Infection rate, reaction to light, and hair follicle apoptosis are examined in the dogmite, Demodex canis Leydig (Prostigmata: Demodicidae), in dogs from the northern area of Taiwan. An analysis of relevant samples revealed 7.2% (73/1013) prevalence of D. canis infection. Infection during the investigation peaked each winter, with an average prevalence of 12.5% (32/255). The infection rates significantly varied in accordance with month, sex, age, and breed (p < 0.05). Most of the lesions were discovered on the backs of the infected animals, where the infection rate was 52.1% (38/73) (P < 0.05). The epidemiologic analysis of infection based on landscape area factor, found that employing a map-overlapping method showed a higher infection rate in the eastern distribution of Taiwan's northern area than other areas. Isolation tests for Microsporum canis Bodin (Onygenales: Arthrodermataceae) and Trichophyton mentagrophyte Robin (Blanchard) on the D. canis infected dogs revealed prevalence rates of 4.4% (2/45) and 2.2% (1/45), respectively. Observations demonstrated that D. canis slowly moved from a light area to a dark area. Skin samples were examined for cellular apoptosis by activated caspase3 immunohistochemical staining. Cells that surrounded the infected hair follicles were activated caspase3-positive, revealing cell apoptosis in infected follicles via the activation of caspase3.
Assuntos
Dermatomicoses/microbiologia , Doenças do Cão/epidemiologia , Interações Hospedeiro-Parasita , Infestações por Ácaros/veterinária , Ácaros/fisiologia , Animais , Apoptose , Comorbidade , Dermatomicoses/epidemiologia , Doenças do Cão/microbiologia , Doenças do Cão/parasitologia , Cães , Eosinófilos , Feminino , Folículo Piloso/patologia , Contagem de Leucócitos , Luz , Masculino , Microsporum/isolamento & purificação , Infestações por Ácaros/epidemiologia , Infestações por Ácaros/microbiologia , Infestações por Ácaros/patologia , Prevalência , Taiwan/epidemiologia , Trichophyton/isolamento & purificaçãoRESUMO
From October 2005 through September 2006, blood samples collected from 1,412 (768 male, 644 female) 1-yr-old and older stray dogs in Taipei City, Taiwan, were tested for antibodies to Toxoplasma gondii using the latex agglutination test (LAT). Antibodies (LAT titers >1:32) to T. gondii were found in 284 (20.1%) of the animals. Seroprevalences were not affected by the sex or density of dogs. The prevalence was highest in dogs from the eastern part of the city.
