IL17A and psoriasis: This study was conducted as part of the update of the European and German psoriasis guidelines aimed to assess current LTBI screening and preventive treatment practices.<h4>Patients and methods</h4>An online survey was distributed via German, European and international dermatological societies, yielding 326 complete responses.<h4>Results</h4>LTBI screening was performed by 45% of respondents before MTX initiation and 95% before IL-17/IL-23/IL-12/23p40 inhibitors.