Costa Valéria Medeiros de Mendonça, Ribeiro Múcio Flávio Barbosa, Duarte Amélia Lizziane Leite, Mangueira Julia Marry, Pessoa André Flávio Almeida, Azevedo Sergio Santos, Barros Antonio Thadeu Medeiros de, Riet-Correa Franklin, Labruna Marcelo Bahia
Unidade Acadêmica de Medicina Veterinária, Centro de Saúde e Tecnologia Rural, Universidade Federal de Campina Grande, Patos, PB, Brazil.
Rev Bras Parasitol Vet. 2013 Apr-Jun;22(2):207-13. doi: 10.1590/S1984-29612013005000022.
The seroprevalence of Anaplasma marginale, Babesia bigemina, Babesia bovis and Trypanosoma vivax and the risk factors for these infections were investigated in 509 cows on 37 farms in the semiarid region of Paraíba, northeastern Brazil. Cow serum samples were tested by means of immunofluorescence assay (IFA) against each specific antigen. The mean seroprevalence values per farm were 15.0% (range: 0-75%) for A. marginale, 9.5% (range: 0-40%) for B. bigemina and 26.9% (range: 0-73.7%) for B. bovis. All cows tested negative for T. vivax. Higher prevalence for A. marginale was significantly associated with less frequent acaricide spraying per year and with higher use of injectable antihelminthics. Presence of cows positive for B. bigemina was significantly associated with acaricide use and with presence of horse flies on the farm. Both occurrence and higher prevalence of B. bovis were significantly associated with recent observations of ticks on cattle. Overall, the present results indicate that the region investigated is an enzootically unstable area for A. marginale, B. bigemina and B. bovis, since most animals were seronegative to at least one agent.
在巴西东北部帕拉伊巴半干旱地区的37个农场的509头奶牛中，调查了边缘无形体、双芽巴贝斯虫、牛巴贝斯虫和活泼锥虫的血清阳性率以及这些感染的危险因素。通过免疫荧光测定法（IFA）对每份牛血清样本针对每种特异性抗原进行检测。每个农场边缘无形体的平均血清阳性率为15.0%（范围：0 - 75%），双芽巴贝斯虫为9.5%（范围：0 - 40%），牛巴贝斯虫为26.9%（范围：0 - 73.7%）。所有奶牛的活泼锥虫检测均为阴性。边缘无形体的较高流行率与每年杀螨剂喷洒频率较低以及注射用抗蠕虫药的较高使用量显著相关。双芽巴贝斯虫阳性奶牛的存在与杀螨剂的使用以及农场厩螫蝇的存在显著相关。牛巴贝斯虫的发生和较高流行率均与近期牛身上蜱虫的观察结果显著相关。总体而言，目前的结果表明，对于边缘无形体、双芽巴贝斯虫和牛巴贝斯虫，所调查的地区是一个动物疫病流行不稳定的地区，因为大多数动物对至少一种病原体血清学呈阴性。
