Abdel-Hafez S K, Al-Yaman F M, Said I M
Z Parasitenkd. 1986;72(1):89-96. doi: 10.1007/BF00927739.
Examination of 471 sheep, 118 goats, 157 cattle and 56 camels slaughtered in abattoirs in North Jordan was carried out during March-May 1984. Drought conditions that prevailed during the preceding winter led to slaughtering old female sheep (greater than or equal to 4 years) due to scarcity of food, which allowed us to analyse the prevalence of hydatidosis in various age groups of sheep. An overall infection rate of 27.8, 1.7, 5.8 and 10.7 percent was found in sheep, goats, cattle and camels, respectively. The infection rate was as low as 1.5 percent in male and 1.9 percent in female sheep under 2 years of age. However, the rate of hydatid infection increased with age and reached as high as 63.7 percent in ewes 4 years of age and older. The percentage of animals with fertile cysts was also highest in sheep (68.7 percent of infected animals) and increased with age reaching 100 percent in ewes which were 10 years of age or older. Analysis of all cysts recovered from the livers and lungs of infected ewes from various age groups revealed a sharp increase in the mean total number of cysts in age groups over 8 years of age. The fertility rate of the cysts in the liver was significantly greater in ewes 6 years old or more (64.8--78.6 percent) than in younger age groups (8.7-46.2 percent). In the lung, the fertility rate increased progressively with age reaching as high as 97.9 percent in ewes 10 years old or more. These findings of high infection and fertility rates of hydatid disease in sheep, particularly of older age groups, prompt plans for further epidemiological studies and control programmes.
1984年3月至5月期间，对约旦北部屠宰场宰杀的471只绵羊、118只山羊、157头牛和56峰骆驼进行了检查。前一年冬季普遍存在的干旱状况导致因食物短缺而宰杀老龄母羊（大于或等于4岁），这使我们能够分析不同年龄组绵羊的包虫病患病率。绵羊、山羊、牛和骆驼的总体感染率分别为27.8%、1.7%、5.8%和10.7%。2岁以下的雄性绵羊感染率低至1.5%，雌性绵羊为1.9%。然而，包虫感染率随年龄增长而上升，4岁及以上的母羊感染率高达63.7%。有育囊动物的百分比在绵羊中也最高（占感染动物的68.7%），并随年龄增长而增加，10岁及以上的母羊达到100%。对从不同年龄组感染母羊的肝脏和肺中回收的所有囊肿进行分析发现，8岁以上年龄组的囊肿平均总数急剧增加。6岁及以上母羊肝脏中囊肿的育囊率（64.8%-78.6%）明显高于较年轻年龄组（8.7%-46.2%）。在肺中，育囊率随年龄逐渐增加，10岁及以上的母羊高达97.9%。绵羊尤其是老龄组包虫病的高感染率和育囊率这些发现促使开展进一步流行病学研究和控制计划。
