- 1 9 8 3 ) ▁ ▁There ▁are ▁different ▁types ▁of ▁E . ▁col i , ▁some ▁of ▁which ▁are ▁found ▁in ▁humans ▁and ▁are ▁har ml ess . ▁ ▁Enter ot ox igen ic ▁E scher ich ia ▁col i ▁( ET EC ) ▁is ▁a ▁type ▁found ▁to ▁cause ▁ill ness ▁in ▁humans , ▁possess ing ▁gene ▁that ▁allows ▁it ▁to ▁manufact ure ▁a ▁subst ance ▁to xic ▁to ▁humans . ▁C attle ▁are ▁imm une ▁to ▁its ▁effects ▁but ▁when ▁people ▁eat ▁food ▁cont amin ated ▁with ▁cattle ▁f ec es , ▁the ▁organ ism ▁can ▁cause ▁disease . ▁Re ports ▁of ▁path ogen ic ▁E . ▁col i ▁appear ▁in ▁medical ▁literature ▁as ▁early ▁as ▁ 1 9 4 7 . ▁ ▁Publications ▁regarding ▁variants ▁of ▁E . ▁col i ▁which ▁cause ▁disease ▁appeared ▁regularly ▁in ▁medical ▁journ als ▁throughout ▁the ▁ 1 9 5 0 s , ▁ 6 0 s , ▁and ▁ 7 0 s , ▁with ▁fatal ities ▁being ▁reported ▁in ▁humans ▁and ▁inf ants ▁starting ▁in ▁the ▁ 1 9 7 0 s . ▁Despite ▁the ▁earlier ▁reports , ▁path ogen ic ▁E . ▁col i ▁did ▁not ▁rise ▁to ▁public ▁prom in ence ▁until ▁ 1 9 8 3 , ▁when ▁a ▁Center ▁for ▁D ise ase ▁Control ▁research er ▁published ▁a ▁paper ▁ident ifying ▁E TE C ▁as ▁the ▁cause ▁of ▁a ▁series ▁of ▁out break s ▁of ▁un exp la ined ▁hem or rh ag ic ▁g astro int est