Estuda-se o comportamento de duas drogas (o 2,6 diiodo para nitrofenol (disofen) e 2 para tiabolil-benzimidazole (Tiabendazole), no tratamento de ovinos naturalmente infestados com nematóides, concluindo-se que ambos são bastante eficientes contra infestação por H. contortus e O. columbianum, com diferença contra formas imaturas daquelas espécies. Por outro lado, o Tïabendazol foi altamente eficaz no combate a T. axei, no abomaso e S. papiliosus, C. punctata e T. colubrijormis, no intestino delgado, mostrando-se o Disofen aparentemente inativo. Não houve atividade das drogas contra B. trigo-. nocephalum e T. ovis.Recomenda-se, à vista dos resultados, o emprêgo alternado das duas drogas.

In a comparative study of two drugs — 2-6-diiodo-para-nitrofenol (Disophenol) and 2-para-thiazolyl-benzimidazole (Thibendazole) — as anthelmintics for naturally infected sheep, the A.A. reached the following conclusions:1) The two drugs were highly efficient against H. contortus and O. cotumbian um;2) Disophenol was superior to Thiabendazole in its efficiency against immature forms of both species;3) Thiabendazole was highly effective against T. axei, S. papiliosus and C. punctata and T. colubriformis inhabiting the small intestines; Disophenol was apparently inactive against these;4) None of the drugs revealed activity against B. trigonocephalum and T. ovis.Taking in consideration all these findings the A.A. recommend ahernative treatments with both drugs as preferable to only one of them.