title: Acquired resistance to Opisthorchis viverrini in the hamster.
abstract: Two groups of ten hamsters received a primary challenge of five Opisthorchis viverrini metacercariae intragastrically (Groups I and III) and a third group was left untreated (Group II). 90 days after the primary challenge Groups I and II were given a further 50 metacercariae. Animals were killed 35 days after the secondary challenge and worm burdens and faecal egg counts evaluated. Compared with Group II animals, Group I showed a 24.88% reduction in mean liver worm burden, a difference which was significant at a level of P less than 0.01 Differences for faecal egg output/worm between Groups I and II were not significant. This is the first effective demonstration of a degree of acquired resistance to O. viverrini and the possible relevance of these findings to the disease in man is discussed.
mesh_terms: D000818:Animals; D006224:Cricetinae; D005243:Feces / Q000469:parasitology; D006790:Host-Parasite Interactions; D007110:Immunity, Active; D008099:Liver / Q000469:parasitology; D008297:Male; D008647:Mesocricetus; D009889:Opisthorchiasis / Q000276:immunology* / Q000469:parasitology; D009891:Opisthorchis / Q000276:immunology; D010270:Parasite Egg Count