Center for Veterinary Medicine,. Rockville, MD, USA.
Vet Parasitol. 2010 Mar 25;168(3-4):261-3. doi: 10.1016/j.vetpar.2009.11.026. Epub 2010 Jan 18.
In this study, we evaluated the prevalence of Toxocara vitulorum in beef calves in North Central Florida. Fecal samples from 433 calves under 9 months of age were analyzed for the presence of eggs in their feces. The prevalence in calves less than 3 months of age was 17.6%, 3-4 months of age was 0.4% and those 5-6 months old had a 0.9% prevalence. As expected, no eggs were detected in any calves older than 6 months. Calves were treated with fenbendazole (10% FBZ) at 5mg/kg after fecal samples were collected. Twenty calves that had T. vitulorum eggs in the feces were resampled 2 weeks after treatment to evaluate effectiveness of FBZ. No T. vitulorum eggs were seen in the feces of 17/20 (85%) of the calves that were sampled after FBZ treatment. FBZ was effective in 85% of calves treated for T. vitulorum infection in calves. We would like to make beef ranchers and veterinarians in the southern states aware that the prevalence of this parasite has greatly increased recently in northern Florida beef units.
在这项研究中，我们评估了佛罗里达州中北部的小牛中 Toxocara vitulorum 的流行情况。对 433 头 9 个月以下的小牛的粪便样本进行了分析，以确定其粪便中是否存在虫卵。3 个月以下的小牛的患病率为 17.6%，3-4 个月的小牛为 0.4%，5-6 个月的小牛为 0.9%。不出所料，任何 6 个月以上的小牛粪便中都没有发现虫卵。在收集粪便样本后，小牛用芬苯达唑（10% FBZ）按 5mg/kg 进行治疗。在治疗后 2 周，对 20 头粪便中含有 T. vitulorum 卵的小牛进行了重新采样，以评估 FBZ 的效果。在接受 FBZ 治疗的 20 头小牛中，有 17/20（85%）的粪便中没有看到 T. vitulorum 卵。FBZ 对 85%的治疗 T. vitulorum 感染的小牛有效。我们希望让南方的肉牛养殖者和兽医知道，这种寄生虫在佛罗里达州北部肉牛养殖场的最近患病率大大增加了。
