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A population-based serosurveillance of syphilis in Costa Rica
(Reprinted from Sexually Transmitted Diseases, Vol. 18, no. 2 (april-June 1991), 1991) Larsen, Sandra A.; Oberle, Mark W.; Sánchez Braverman, Juana M.; Rosero Bixby, Luis; Vetter, Kathleen M.
As part of a case-control study to investigate the high incidence of cervical cancer in Costa Rican women, the seroprevalence of the trepnematoses, in particular, syphilis was determined. In each age group, women with a history of two or more sex partners were two to four times more likely to be seroreactive in tests for syphilis than women with zero or one sex partner. The highest percentage of reactive results in the microhemagglutination assay for antibodies to Trepnema pallidum (MHATP) was seen in samples from women aged 50-59 who had had two or more lifetime partners (23.8%). Three observations from our study support reactivity due to syphilis rather than yaws or pinta: ( /) a similar percent of reactive rapid plasma reagin (RPR) card test results among MHA-TP reactors in the two age groups of women who were surveyed (42 vs. 49%) was observed; (2) women who were seroreactive in the MHA-TP had multiple risk factors for STD (low socioeconomic status (9.4%), urban residence (22.8%), first intercourse under 16 years of age (14.1%), and multiple sex partners (26.3%)|, and (j) only sexually experienced women had reactive results in the MHA-TP test.