McKenna P B
Batchelar Animal Health Laboratory, PO Box 536, Palmerston North, New Zealand.
N Z Vet J. 1995 Nov;43(6):225-7. doi: 10.1080/00480169.1995.35897.
Larval cultures and faecal egg count reductions were used to determine the identities and frequencies of occurrence of nematode genera involved in cases of ovine anthelmintic resistance submitted to the Batchelar Animal Health Laboratory between 1992 and 1994. Based on an examination of 102 cases, it was found that, while there were some differences relating to the method of assessment, the genera most frequently involved were Trichostrongylus, Ostertagia and Nematodirus. Also implicated, although less commonly, were infections of Oesophagostomum/Chabertia, Haemonchus and Cooperia. The majority of cases involved resistance in two or more genera, with resistance in a single nematode genus occurring in 45% of cases. Most such monogeneric resistances comprised infections of Trichostrongylus (52%), Ostertagia (17%) or Nematodirus (11%). Anthelmintic resistance involving Haemonchus alone was found in only three cases. These results suggest that the potential role of narrow-spectrum drenches in the management and control of anthelmintic-resistant worms in New Zealand sheep is likely to be strictly limited.
1992年至1994年间，将幼虫培养和粪便虫卵计数减少法用于确定提交给巴彻勒动物健康实验室的绵羊抗蠕虫药耐药病例中涉及的线虫属的种类和出现频率。通过对102个病例的检查发现，虽然在评估方法上存在一些差异，但最常涉及的属是毛圆线虫属、奥斯特他线虫属和细颈线虫属。也有牵连的，虽然不太常见，是结节虫属/夏伯特线虫属、血矛线虫属和古柏线虫属的感染。大多数病例涉及两个或更多属的耐药性，单个线虫属出现耐药性的病例占45%。大多数此类单属耐药性包括毛圆线虫属（52%）、奥斯特他线虫属（17%）或细颈线虫属（11%）的感染。仅在三例中发现单独涉及血矛线虫属的抗蠕虫药耐药性。这些结果表明，窄谱驱虫剂在新西兰绵羊抗蠕虫药耐药蠕虫的管理和控制中的潜在作用可能非常有限。
