▁guidance ▁on ▁health y ▁e ating . ▁ ▁Research ▁ ▁Research ▁efforts ▁are ▁focused ▁on ▁new ▁ang i ogen ic ▁treatment ▁modal ities ▁and ▁various ▁( ad ult ) ▁stem - cell ▁ther ap ies . ▁A ▁region ▁on ▁chrom os ome ▁ 1 7 ▁was ▁conf ined ▁to ▁families ▁with ▁multiple ▁cases ▁of ▁my oc ard ial ▁inf ar ction . ▁Other ▁gen ome - wide ▁studies ▁have ▁identified ▁a ▁firm ▁risk ▁variant ▁on ▁chrom os ome ▁ 9 ▁( 9 p 2 1 . 3 ). ▁However , ▁these ▁and ▁other ▁lo ci ▁are ▁found ▁in ▁inter gen ic ▁segments ▁and ▁need ▁further ▁research ▁in ▁understanding ▁how ▁the ▁phen ot ype ▁is ▁affected . ▁ ▁A ▁more ▁controvers ial ▁link ▁is ▁that ▁between ▁Ch lam yd oph ila ▁p neum onia e ▁in fection ▁and ▁a ther os cl eros is . ▁While ▁this ▁int rac ell ular ▁organ ism ▁has ▁been ▁demonstrated ▁in ▁a ther os cler otic ▁pla ques , ▁evidence ▁is ▁incon clus ive ▁as ▁to ▁whether ▁it ▁can ▁be ▁considered ▁a ▁caus ative ▁factor . ▁Tre at ment ▁with ▁ant ib iot ics ▁in ▁patients ▁with ▁proven ▁a ther os cl eros is ▁has ▁not ▁demonstrated ▁a ▁decre ased ▁risk ▁of ▁heart ▁attacks ▁or ▁other ▁coron ary ▁v asc ular ▁dise ases . ▁ ▁Since ▁the ▁ 1 9 9 0 s ▁the ▁search ▁for ▁new ▁treatment ▁options ▁for ▁coron ary ▁ar tery ▁disease ▁patients , ▁particularly ▁for ▁so ▁called ▁" no - option " ▁coron ary