@article {Lyytik{\"a}inen19, author = {E Lyytik{\"a}inen and M Kaasila and P Koskela and M Lehtinen and T Patama and E Pukkala and K Tasanen and H-M Surcel and J Paavonen}, title = {Chlamydia trachomatis seroprevalence atlas of Finland 1983{\textendash}2003}, volume = {84}, number = {1}, pages = {19--22}, year = {2008}, doi = {10.1136/sti.2007.027409}, publisher = {The Medical Society for the Study of Venereal Disease}, abstract = {Objectives: To study Chlamydia trachomatis seroprevalence trends and geographical distribution over time in Finland.Materials and methods: First pregnancy serum samples were retrieved from the Finnish Maternity Cohort serum bank for the subcohort of 8000 women stratified by calendar years (1983{\textendash}1989, 1990{\textendash}1996, 1997{\textendash}2003) and age at time of sample withdrawal (14{\textendash}22 and 23{\textendash}28 years). C trachomatis antibodies were determined using standard major outer membrane protein peptide ELISA. The spatiotemporal variation of C trachomatis seroprevalence rates was visualised by a series of maps.Results: A decreasing C trachomatis seroprevalence trend from 1983 to 2003 was seen for both women under 23 years of age (20.8\% to 10.6\%) and 23{\textendash}28-year-old women (19.1\% to 12.5\%). Constant clusters were seen around the largest cities and in eastern Finland although seroprevalence rates were generally decreasing throughout the country.Conclusions: Only a few population-based serological studies have been undertaken on C trachomatis epidemiology over time. In Finland the seroprevalence of C trachomatis is decreasing all over the country, albeit with small clusters remaining.}, issn = {1368-4973}, URL = {https://sti.bmj.com/content/84/1/19}, eprint = {https://sti.bmj.com/content/84/1/19.full.pdf}, journal = {Sexually Transmitted Infections} }