Types of STIs

There are three types of STIs: bacterial, viral and parasites (lice).

The bacterial infections are Chlamydia, Gonorrhoea, Syphilis, Non-specific Urethritis (NSU) and Bacterial Vaginosis.

Bacterial infections are treated with antibiotics.

Chlamydia is the most common STI in the UK. Rates are highest in young people, with 1 in 12 sexually active people under 25 having the infection. Most people with Chlamydia have no symptoms. If it is left undiagnosed and untreated, Chlamydia can cause long-term problems including infertility. Pick up a free Chlamydia testing kit at your Pharmacy or Contraception & Sexual Health services.

Or, you can receive a Chlamydia testing kit in the post if you follow this link here.


Viral infections are HIV, Herpes, Genital Warts and Hepatitis B.

Viral infections are treated with Antiviral tablets; genital warts are treated with creams, freezing or laser.


Parasites include Pubic lice, also known as 'crabs'.

Parasites are treated by lotions.


It's important to test yourself every year and every time you change sexual partners. You should especially test if you have had unprotected sex.