HP and coronary artery disorder: However, HP IgG antibody titers may correlate with the extent of CAD.[33] In 2004, a study done in Korea revealed that HP infection is not an independent risk factor for coronary heart disease, and it does not alter the coagulation system or evoke the system inflammatory response.[28] Another study done in Poland to detect HP in atherosclerotic plaques did not trace DNA of bacteria in any of the patients that underwent coronary artery bypass graft (CABG).[34]