| prevalence and persistence of chlamydia pneumoniae antibodies in healthy laboratory personnel in finland. | the rates of chlamydia pneumoniae seroconversions suggesting acute primary infections or reinfections and the prevalences of antibodies were followed up among healthy laboratory workers. annual serum samples were collected from 47 persons in helsinki from 1958 to 1990 and from 40 persons in oulu from 1994 to 1999. c. pneumoniae species-specific immunoglobulin g (igg), iga, and igm antibodies were measured by microimmunofluorescence (mif) in 407 sera from helsinki. the 185 sera collected in oulu ... | 2005 | 15879028 |