A comparative study of the succinate dehydrogenase-fumarate reductase complex in the genus Trichinella.

Succinate dehydrogenase and fumarate reductase activities from a particulate fraction of 4 isolates of the supposed 'species' of Trichinella, T. spiralis, T. pseudospiralis, T. nativa and T. nelsoni have been determined using spectrophotometric methods. The 'in vitro' effect of the anthelmintics thiabendazole, mebendazole and ivermectin on succinate dehydrogenase and fumarate reductase activities from the above isolates is also described. The significance of the results is discussed in the context of the controversy that surrounds speciation of the genus Trichinella.