▁H . ▁P yl ori ▁came ▁in ▁ 1 8 9 2 ▁from ▁Giul io ▁B izz oz ero , ▁who ▁identified ▁acid - tol er ant ▁b acter ia ▁living ▁in ▁a ▁dog ' s ▁st om ach . ▁Later , ▁a ▁theory ▁would ▁be ▁developed ▁that ▁no ▁b acter ia ▁could ▁live ▁in ▁the ▁st om ach . ▁Although ▁the ▁theory ▁has ▁no ▁scientific ▁basis , ▁it ▁would ▁become ▁a ▁st umb ling ▁block ▁for ▁scient ists , ▁disc ou rag ing ▁them ▁for ▁searching ▁for ▁inf ect ive ▁causes ▁of ▁st om ach ▁ul cers . ▁In ▁ 1 9 4 0 , ▁two ▁phys icians , ▁Dr . ▁A . ▁Stone ▁Free berg ▁and ▁Dr . ▁Louis ▁E . ▁Bar ron ▁published ▁a ▁paper ▁describing ▁a ▁spir al ▁b acter ia ▁found ▁in ▁about ▁half ▁of ▁their ▁g astro enter ology ▁patients ▁who ▁had ▁st om ach ▁ul cers . ▁Dr . ▁John ▁Ly kou dis , ▁a ▁Greek ▁phys ician , ▁was ▁one ▁of ▁the ▁first ▁phys icians ▁to ▁treat ▁st om ach ▁ul cers ▁as ▁an ▁inf ect ious ▁disease . ▁Between ▁ 1 9 6 0 ▁and ▁ 1 9 7 0 , ▁he ▁treated ▁over ▁ 1 0 , 0 0 0 ▁ul cer ▁patients ▁in ▁Ath ens ▁with ▁ant ib iot ics . ▁ ▁Ly kou dis ▁tried ▁to ▁publish ▁a ▁paper ▁on ▁his ▁find ings , ▁but ▁they ▁conflic ted ▁with ▁traditional ▁theory , ▁and ▁his ▁work ▁was ▁never ▁published . ▁ ▁Ly