_:vb50952522 . _:vb50952522 "url:http://jvdi.org/cgi/reprint/1/2/195.pdf"^^ . _:vb50952522 . _:vb50952522 "A trichostrongyloidiasis that involves parasitic infection of the ruminant gastrointestinal tract by nematodes of the genus Ostertagia."^^ . _:vb50952522 . _:vb50952522 . _:vb50952522 .