CALCA and infectious disease: Measurement of serum PCT level has beenconsidered as a diagnostic method, first in childrenand then in adults, over the last decade, althoughthere are conflicts over its clinical application (11).Due to changes in salivary biomarkers of periodontitis,this study was conducted on patients withchronic periodontitis, which is the most commontype of periodontitis (12), to assess the associationbetween periodontitis as an infectious disease andsalivary PCT.