Chlamydia abortus, the etiologic agent of ovine enzootic abortion, is one of the most important causes of abortion in sheep and goats. This study assessed the prevalence of C.abortus in vaginal & ocular swabs of small ruminants and determined the risk factors of flock infection.

In this cross-sectional study, 834 swab samples were taken from 83 flocks and were then tested for C.abortus DNA by real-time PCR. A checklist containing general information of the animals was filled for each flock. Data were analyzed using univariate tests (chi square and t-tests) and multivariable binary logistic regression analysis.

C.abortus DNA was detected in 201(24.1%) of the animals (95% CI: 21.2–27). In multivariable binary logistic regression, gender, purchasing animal without pre purchase testing, having sold animals that aborted, mineral supplementation, geographic location and presence of conjunctivitis in the individual animals were found to be related with the infection.

This study confirmed the high prevalence of C.abortus among sheep and goat flocks in Iran. Ranchers training in the fields of quarantine and sanitary practices and implementation of chlamydia vaccination program are necessary.

羊类动物流产的病原体流产衣原体是绵羊和山羊流产的最重要原因之一。这项研究评估了小反刍动物的阴道和眼拭子中的C.abortus患病率，并确定了鸡群感染的危险因素。

在这项横断面研究中，从83个鸡群中采集了834个拭子样本，然后通过实时PCR检测了其腹中梭状芽胞杆菌DNA。每个鸡群都要填写一份清单，其中包含动物的一般信息。使用单变量检验（卡方检验和t检验）和多变量二元logistic回归分析对数据进行分析。

在201（24.1％）的动物中检出了弓形虫DNA（95％CI：21.2–27）。在多变量二元logistic回归中，发现性别，未进行购买前测试的购买动物，已出售流产的动物，补充矿物质，地理位置以及各动物中结膜炎的存在与感染有关。

这项研究证实了伊朗羊群和山羊群中腹足梭菌的高流行。必须对牧场主进行检疫和卫生措施培训以及衣原体疫苗接种计划的实施。