Evolution of notified sexually transmitted infections in Barcelona during the first wave of the COVID-19 pandemic (a) Gonorrhoea cases, (b) LGV (c), primary syphilis, (d) secondary syphilis, (e) early syphilis, (f) HIV and (g) HIV postexposure prophylaxis. gl This study shows a marked decrease either in the newly reported STIs or in the number of PEP treatments in Barcelona from March to September 2020. A retrospective study including all cases of gonorrhoea, primary and secondary syphilis, lymphogranuloma venereum (LGV) and new HIV diagnoses reported to the Public Health Agency of Barcelona (ASPB), from January 2019 to September 2020, was carried out. [Extracted from the article]