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To determine whether Chlamydia pneumoniae (C. pneumoniae) infection is associated with hypertension in Japanese adults, we measured serum levels of IgA (a marker of reinfection) and of IgG (a marker of previous infection) antibodies to C. pneumoniae by enzyme-linked immunosorbent assay in 112 adults including normotensive and untreated hypertensive subjects and in 117 hypertensive subjects who had...