CD79A and chlamydia infectious disease: Provided that the mucosal CAT test has a high specificity, larger population-based studies and further prospective cohort studies are needed to assess to what extent and when IgA in vaginal (self-)swabs could be of value as a biomarker, on its own or in combination with other immunological host-related markers, indicating which women have a higher chance to develop late sequelae from Chlamydia infections.