Abstract
Syphilis is a bacterial sexually transmitted disease (STD), whose main route of infection is through sexual contact. In order to diagnose syphilis, Treponema pallidum must be detected in the material sampled from a lesion and a blood test must be performed in order to detect serological response to syphilis. Since 1946, a statutory obligation to report all cases of syphilis has been in force in Poland, which is why data concerning the incidence is available. The aim of this paper is to analyse trends in syphilis incidence in the years 1950–2017 using Joinpoint Regression and to present the impact of prophylaxis and education of society on syphilis prevention. The Joinpoint Regression method indicated the splitting time points of the trend corresponding to real changes in incidence, which corroborates the purpose of using the method in question in epidemiological studies.