Delayed diagnosis of colorectal sexually transmitted diseases due to their resemblance to inflammatory bowel diseases

Colorectal STDs may resemble IBD and therefore their diagnosis may be delayed. IBD symptoms in MSM who engage in non-protected anal sex should prompt at least syphilis and anal PCR for STD testing. If C. trachomatis is diagnosed but LGV subtyping cannot be done, doxycycline 100 mg twice daily for 21 days should be recommended.