, ▁for ▁instance ▁during ▁hunting , ▁but ch ery , ▁or ▁inter - species ▁sexual ▁contact . ▁ ▁Cy clos por a ▁( 1 9 9 5 ) ▁ ▁Cy clos por a ▁is ▁a ▁g astro int est inal ▁path ogen ▁that ▁causes ▁fe ver , ▁di arr he a , ▁vom iting , ▁and ▁severe ▁weight ▁loss . ▁ ▁Out break s ▁of ▁the ▁disease ▁occurred ▁in ▁Chicago ▁in ▁ 1 9 8 9 ▁and ▁other ▁areas ▁in ▁the ▁United ▁States . ▁But ▁investigation ▁by ▁the ▁Center ▁for ▁D ise ase ▁Control ▁could ▁not ▁identify ▁an ▁inf ect ious ▁cause . ▁The ▁discovery ▁of ▁the ▁cause ▁was ▁made ▁by ▁Mr . ▁Ram ach and ran ▁Raj ah , ▁the ▁head ▁of ▁a ▁medical ▁clin ic ' s ▁labor atory ▁in ▁Kath m and u , ▁Nep al . ▁Mr . ▁Raj ah ▁was ▁trying ▁to ▁discover ▁why ▁local ▁residents ▁and ▁visitors ▁were ▁becoming ▁ill ▁every ▁summer . ▁He ▁identified ▁an ▁unusual ▁looking ▁organ ism ▁in ▁st ool ▁samples ▁from ▁patients ▁who ▁were ▁sick . ▁But ▁when ▁the ▁clin ic ▁sent ▁sl ides ▁of ▁the ▁organ ism ▁to ▁the ▁Center ▁for ▁D ise ase ▁Control , ▁it ▁was ▁identified ▁as ▁blue - green ▁alg ae , ▁which ▁is ▁har ml ess . ▁Many ▁path olog ists ▁had ▁seen ▁the ▁same ▁thing ▁before , ▁but ▁dismiss ed ▁it ▁as ▁irrelevant ▁to ▁the ▁patient ' s ▁disease . ▁Later , ▁the ▁organ ism ▁would ▁be ▁identified ▁as ▁a ▁special ▁kind ▁of ▁par as ite