中文摘要：

目的调查分析广西某采血站献血员感染巴贝虫情况,提供我国巴贝虫的流行病学基础资料,也为安全输血提供科学依据。方法于2013年从广西某血站搜集抗凝输血袋残留血,共计1 900份,采用巴贝虫属18SrRNA和β-tubulin的引物Nest-PCR、形态学观察及间接荧光免疫方法（IFA）,对献血员血液内的巴贝虫感染情况进行检测。结果广西某采血站献血员血液内巴贝虫感染总阳性率为2.53%（48/1 900）,均为田鼠巴贝虫（Babesia microti）,巴贝虫属18SrRNA引物扩增灵敏度远高于β-tubulin引物。显微镜检查有38份标本在红细胞内发现有核呈圆形且致密、胞质呈环形且纤细的环状体,巴贝虫属18SrRNA的Nest-PCR阳性标本血清IFA在抗体滴度≥1∶64未观察到特异性荧光,视为阴性。结论健康献血员中存在一定比例的Babesia microti感染率,对于有免疫功能低下的接受输血者来说,应当增加输血样本的巴贝虫检测。

英文摘要：

Objective To know about the Babesia infection situation in the blood donors in Guangxi, China, so as to provide a basical epidemical date, and to provide scientific proofs for safety blood transfusion. Methods A total of 1 900 peripheral blood samples were obtained from tubes of used blood bagstaking from Guangxi, China in 2013. Babesia spp. infections in the donors were tested using Babesia 18S rRNA and β-tubulin Nest-PCR, morphological observation, and indirect immunofluorescence assay （IFA）. Results We found that the positive rate of Babesia infection was 2. 53% （48/1 900） in Guangxi, with all cases caused by Babesia microti. The PCR sensitivity of Babesia 18S rRNA primer was much higher than that of β-tubulin. In 38 blood the erythrocytes were found to have circular and dense nuclear, with ring-form thin cytoplasm under microscope. The specific fluorescence was not observed when Nest-PCR positive specimens with IFA at ≥ 1 ： 64 antibody concentration, and was taken as negative. Conclusion There is a certain proportion of Babesia microti infection in Guangxi. For those patients with immunocompromised condition who needs blood transfusion, Babesia rnicroti should been tested in blood donors.