Revenga J E
Centro Regional Universitario Bariloche, Universidad Nacional del Comahue, Argentina.
J Parasitol. 1993 Jun;79(3):379-83.
Diphyllobothrium dendriticum and Diphyllobothrium latum are reported for the first time from Argentina. The following species from Lake Moreno (southern Argentina) were studied to determine whether plerocercoids were present: 11 brook trout (Salvelinus fontinalis), 32 perca (Percichthys sp.), 21 pejerrey (Patagonina hatcheri), and 114 rainbow trout (Oncorhynchus mykiss). Brook trout harbored both species (27.3% prevalence of D. dendriticum and 9.0% of D. latum); perca harbored only D. latum (18.7% prevalence); pejerrey were not infected and rainbow trout also harbored both species, with significant association. Diphyllobothrium latum was less abundant (1.4 plerocercoids/fish, 28.0% prevalence) than D. dendriticum (7.2 plerocercoids/fish, 57.8% prevalence) implying a lower health risk for humans. For both parasites, rainbow trout seem to be more important than the other host species studied. There is no evidence that either of the species is more harmful to the host. The lack of significant weight variation of the liver as related to intensity of infection strongly suggests that competition for energy is not an important aspect of the host pathology.
阿根廷首次报告发现了树枝状裂头绦虫和阔节裂头绦虫。对来自莫雷诺湖（阿根廷南部）的以下物种进行了研究，以确定是否存在裂头蚴：11条溪鳟（红点鲑）、32条鲈（鲈属物种）、21条佩氏南美胡瓜鱼和114条虹鳟。溪鳟体内寄生有这两种绦虫（树枝状裂头绦虫的感染率为27.3%，阔节裂头绦虫的感染率为9.0%）；鲈只感染了阔节裂头绦虫（感染率为18.7%）；佩氏南美胡瓜鱼未被感染，虹鳟也同时寄生有这两种绦虫，且存在显著关联。阔节裂头绦虫的数量（每条鱼1.4个裂头蚴，感染率28.0%）比树枝状裂头绦虫少（每条鱼7.2个裂头蚴，感染率57.8%），这意味着对人类的健康风险较低。对于这两种寄生虫而言，虹鳟似乎比所研究的其他宿主物种更为重要。没有证据表明这两种物种对宿主的危害更大。肝脏重量与感染强度之间缺乏显著的变化，这强烈表明能量竞争并非宿主病理学的一个重要方面。
