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Studies on STI incidence and pre-exposure prophylaxis (PrEP) use are often hampered by the absence of STI incidence data in the period before PrEP; Beymer et al 1 set out to improve on this. They report on the STI incidence before and after initiation of PrEP in a cohort of men who have sex with men at the Los Angeles LGBT Center, California, USA. We fear …
Contributors SHH drafted the letter. EH and MFSvdL provided feedback and edited the letter. All authors agree with the final version of the letter.
Funding None declared.
Competing interests None declared.
Ethics approval Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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