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Studies on the fate of Taenia hydatigena and Taenia ovis larvae in rabbits, and cross immunity with Taenia pisiformis larvae

Studies on the fate of Taenia hydatigena and Taenia ovis larvae in rabbits, and cross immunity with Taenia pisiformis larvae

International Journal for Parasitology 7(4): 257-267

Millipore membrane diffusion chambers containing activated oncospheres of T. hydatigena, T. ovis or T. pisiformis were implanted i.p. into rabbits. T. pisiformis and T. hydatigena developed to larvae 3 mm in length within diffusion chambers, but T. ovis oncospheres underwent little reorganization. Exogenous and possibly somatic antigens released by T. pisiformis larvae developing in diffusion chambers stimulated strong immunity in rabbits to challenge infection with T. pisiformis eggs. T. hydatigena induced a high degree of cross immunity against T. pisiformis larvae following either oral dosing with eggs or development of larvae in i.p. diffusion chambers. T. ovis failed to cross immunize against T. pisiformis infection by any of the methods studied. Oncospheres of all 3 spp. hatched and activated in the small intestine of rabbits and readily penetrated the intestinal epithelium and passed to the liver. Histological sections suggested that oncospheres primarily forced their way between epithelial cells rather than utilizing lytic enzymes to destroy them. T. pisiformis larvae followed their normal pattern of development in the liver. Both T. hydatigena and T. ovis produced liver lesions identical to those of T. pisiformis at 2 and 4 days after infection (DAI). Lesions due to T. ovis had resolved by 8 DAI and those produced by T. hydatigena by 16 DAI. Although T. hydatigena had not undergone any apparent advanced development in the rabbit's livers, antigens had been released which cross immunized against T. pisiformis; these antigens must be produced at an early stage in larval development. Rabbits vaccinated with antigens collected during in vitro cultivation of T. ovis larvae showed significant enhancement of the T. pisiformis challenge infection. The possible significance of cross immunity in relation to the frequency of occurrence of harmful taeniid infections of man is discussed.

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Accession: 006516573

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PMID: 924711

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