Objective To understand the distributional features and prevalent trend of syphilis among different populations in Chifeng,so as to provide basis for formulating countermeasures in the future.Method Do statistical analysis for the syphilitic cases reported by medical units at different levels from 2009 to 2011 in Chifeng.Results 1 538 syphilis cases were reported from 2009 to 2011,including 795 men and 743 women,with the sexual ratio of 1.07∶1.The morbidity of men was higher than that of women in each perio...