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First report of Lymnaea columella Say, Pulmonata: Lymnaeidae naturally infected with Fasciola hepatica Linnaeus, Trematoda: We report the first evidence of natural infection of Lymnaea columella with Fasciola hepatica in Argentina. A sample of snails was collected in May in northeastern Corrientes, a province bounded on the north by Paraguay, on the east by Brazil and on the southeast by Uruguay.
Among examined snails, 44 8. Parasite identification was based on morphological features of cercariae from snails, and of eggs and adult flukes from Wistar rats. We discuss the events suggesting that an enzootic transmission cycle of F. Lymnaea columella - Fasciola hepatica infection - Argentina. Fasciolosis, caused by the zoonotic liver fluke Fasciola hepatica , is an important disease of domestic livestock producing a worldwide economic loss. Snails belonging to genus Lymnaea are the known intermediate hosts of F.
However, the occurrence of specimens naturally infected with F. In Uruguay, search of the parasite in L. The objective of the present study is to report the first finding of L. This province is bounded on the north by Paraguay, on the east by Brazil and on the southeast by Uruguay. The sampling sites were temporary streams bordered on both sides by aquatic vegetation and grass. These streams, which were frequently visited by free roaming cows, collected water from a permanent lagoon.
Snails were taken to the laboratory in plastic recipients holding wet cotton pads. Upon arrival, five specimens were relaxed, killed, and preserved in Railliet-Henry's fluid Paraense , and taxonomically determined by features of the shell and internal organs Paraense The rest of the individuals, which were identical in external appearance to those already identified, were kept alive for parasitological analysis. The shell length of all snails was measured from the apex to the anterior margin.
Cercarial shedding was checked for one month according to Souza et al. Preserved and alive snails were dissected to detect trematode larvae in viscera. Finally, 25 metacercariae were orally administered to each of six Wistar rats days old to confirm identity of F.