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Infection rate of Babesia spp. sporokinetes in engorged Boophilus microplus from an area of enzootic stability in the State of Minas Gerais, Brazil
Quintão-Silva, Maria G; Ribeiro, Múcio F. B.
  • Quintão-Silva, Maria G; Universidade de Alfenas. Alfenas. BR
  • Ribeiro, Múcio F. B; Universidade Federal de Minas Gerais. ICB. Departamento de Parasitologia. Belo Horizonte. BR
Mem. Inst. Oswaldo Cruz ; 98(8): 999-1002, Dec. 2003. tab, graf
Artículo en Inglés | LILACS | ID: lil-355732
ABSTRACT
The infection rates of Babesia sporokinetes in engorged Boophilus microplus were evaluated during a 2-year period in a dairy farm located in an area of enzootic stability. Every 14 days engorged females were collected from calves and from adult animals. Ticks were incubated at 27 ± 0.5ºC and 80-90 percent relative humidity and Babesia infection rates were determined by microscopic examination of Giemsa-stained hemolymph smears. After 52 collections, 2105 ticks were obtained, from which 982 were collected from calves and 1123 from cows. The total Babesia infection rate was 10 percent, however the incidence was higher (p < 0.05) in ticks collected from calves (17.5 percent) than in those collected from cows (3.6 percent). Females collected from cows showed the highest infection rates in January, March, and August, and absence of infection in April and May. Ticks feeding on calves were infected throughout the experimental period. The infection rates of engorged females collected from naturally infected calves that were artificially infested with Babesia-free-larvae of B. microplus gradually decreased until the calves were four months old. No differences were observed among infection rates of ticks collected from calves maintained under natural conditions.
Asunto(s)
Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Babesia / Garrapatas Límite: Animales País/Región como asunto: America del Sur / Brasil Idioma: Inglés Revista: Mem. Inst. Oswaldo Cruz Asunto de la revista: Medicina Tropical / Parasitología Año: 2003 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: Universidade Federal de Minas Gerais/BR / Universidade de Alfenas/BR

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Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Babesia / Garrapatas Límite: Animales País/Región como asunto: America del Sur / Brasil Idioma: Inglés Revista: Mem. Inst. Oswaldo Cruz Asunto de la revista: Medicina Tropical / Parasitología Año: 2003 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: Universidade Federal de Minas Gerais/BR / Universidade de Alfenas/BR