Presence of and in the oral cavity of a Northern Thailand population that experiences stomach pain.

: To investigate oral diseases and microbiological conditions, such as the presence of ureolytic bacteria in dental plaque, in relation to experience of stomach pain in a remote adult Asian population. : Ninety-three adults, 40-60-years old, from the Karen Hill tribe in Northern Thailand with no regular access to dental care were examined. Clinical registrations were performed and interproximal gingival plaque samples were collected and analyzed with the checkerboard (CKB) method for the presence of 14 oral bacterial species. : A number of 61 subjects reported daily stomach pain while 32 subjects had no symptoms from the stomach. The subjects with stomach pain had fewer remaining teeth ( < 0.05), higher caries experience ( < 0.05) and less BoP ( < 0.01). Most of the bacterial species were clustered statistically in three factors in a factor analysis, which together explained 65% of the microbiological variance. Factor 1, explaining 43.0% of the variance, was statistically associated with stomach pain ( < 0.001). : The interproximal plaque/biofilm in adults of the study population showed a common presence of two gastrointestinal pathogens  and The study also indicates for the first time a potential association between  and stomach pain.