[Seroprevalence of anaplasmosis in bovine herds from 18 municipalities in Northern Veracruz State [Mexico]] | Seroprevalencia de anaplasmosis en explotaciones bovinas de 18 municipios de la zona norte de Veracruz

English. The seroprevalence to Anaplasma marginale was determinated in the northern part of Veracruz State by the Complement Fixation test. The sample size was estimated in 37 cattle per herd. Seven hundred and eighty five serum samples were collected from differents ages and breeds from 21 herds located in 18 municipalities. The overall prevalence was 56 % and the prevalence rang was 12 - 90 %. The seroprevalence was higher as the age of the animals increased. The herd size also influenced seroprevalence as it was higher in herds with more than 300 leads. Bovine anaplasmosis is endemic in northern Veracruz State and preventive measures should be taken when susceptible animals are introduced to endemics anaplasmosis regions

Spanish; Castilian. Con objeto de estimar la prevalencia de Anaplasma marginale en ganado bovino de la zona norte del estado de Veracruz, se analizaron 785 sueros por medio de la prueba de fijacion del complemento. El tamano de muestra se calculo en 37 bovinos por rancho. El total de muestras se obtuvo a partir de animales de diferentes edades y razas, de 21 ranchos localizados en 18 municipios. La seroprevalencia general fue de 56% con una variabilidad de 12 al 90%. Se observo que la seroprevalencia aumenta con la edad. Con respecto al tamano de hato se encontro que en ranchos con mas de 300 bovinos existe mayor porcentaje de seropositivos (72%) 3. La anaplasmosis bovina es endemica en el norte del estado de Veracruz, debiendose observar medidas preventivas previas a la introduccion de animales susceptibles o procedentes de zonas libres de anaplasmosis