25916135
OBJECTIVE	To study the prevalence of H. pylori CagA strain and the activity of associated gastritis in schoolchildren of Tyva Republic ( Russia ) .
METHODS	The cohorts had been formed out of 1064 native and alien schoolchildren picked up by random in Tyva Republic in the ages from 7 to 17 years .
METHODS	We determined IgG to H. pylori CagA antigen in serum ( 106 aliens and 112 natives ) .
METHODS	Out them 59 Tuvins and 72 Europoids with dyspeptic complaints were provided with endoscopic tests including biopsy of mucosa of antrum and stomach body .
RESULTS	We had found ethnic peculiarities in the obtained indices in children , namely higher prevalence of the said strain of H. pylori and the absence of meaningful activity in antral sector and body of stomach in CagA-seropositive native children as compared to alien ones , in whom the activity of antral gastritis was higher than the activity in body of stomach .

