Abstract
Forty-five strains of sulf ate-reducing bacteria showed marked differences in their resistance to Hibitane (I.C.I. Ltd) and, to a lesser degree, to cetyltrimethylammonium-bromide. Panacide (British Drug Houses Ltd.) was effective against all the strains. The relevance of these findings to modern views on the taxonomy of the sulfate-reducers and to the problem of inhibiting these organisms in the field is discussed.