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What is an STI?

A sexually transmitted infection (STI) is an infection that can be passed from person to person when having sex. You can get an STI by having vaginal sex, anal sex, or oral sex. There are several different types of STI.

What are the main STIs?

The ten most common STIs in the UK are:

  • Anogenital warts,  
  • Chlamydia, 
  • Genital herpes, 
  • Gonorrhoea, 
  • Human immunodeficiency virus (HIV), 
  • Hepatitis B,
  • Hepatitis C, 
  • Pubic lice, 
  • Syphilis 
  • Trichomonas Vaginalis

You can be tested for STIs at a contraception and sexual health clinic, genitourinary medicine (GUM) clinic or GP surgery. For more information on STI’s visit


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