A study was made of the prevalence of anti C. pylori in the healthy adult population. The analytical method used was indirect immunofluorescence. An analysis was made of 231 sera (122 males and 109 females) from subjects 20 to 82 years-old. The global positivity detected was 21.1%. There was a slight rise in the percentage of positivities as age increased, reaching the maximum rate in the group over 50 years (2.1%). The titers detected were low and unrelated to age. No significant differences by sex were found in the subjects analyzed.
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