Prevalence of antibodies to Chlamydia trachomatis in Japanese persons determined by microimmunofluorescence using reticulate bodies as single antigen

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Abstract
The incidence of humoral antibodies to Chlamydia trachomatis was determined in 1005 Japanese individuals of various ages. Formalin-fixed purified reticulate bodies of C. trachomatis (L2(434) strain) were used as antigens in the microimmunofluorescence test. Of 137 pregnant women, 25 (18.2%) had antibody titers of 1:10 or larger. Of 120 cord blood specimens from newborns, 16 (13.3%) were positive. Among 565 infants and children a progressive, age-related increase in seropositivity was observed except in 6- to 8-year-olds: 9.2% for infants under 1 year old; 20.8 to 25.0% for 1-to 5-year-olds; 11.7 to 17.6% for 6- to 8-year-olds; and 26.1 to 32.3% for 9- to 15-year-olds. Among 183 adults the seropositivity rate was between 20.0 and 26.7%, and a progressive increase in seropositivity was not clearly observed. These data suggest that C. trachomatis infection occurs commonly in Japanese adults and children.

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