Bacterial STIs are caused by bacteria being transmitted between two people during sexual activity. Bacterial STIs can be cured with a course of antibiotics, as long as you get tested by your doctor and take the full course of medication. Someone with a bacterial STI should avoid any sexual contact until they are fully cured so as not to pass the infection on, and any sexual partners should get tested for the infection.

There are three infections in this category: Chlamydia, Gonorrhoea, and Syphilis


Chlamydia is one of the most common STIs in the world today Chlamydia is caused by Chlamydia trachomatis bacteria. It is most common among people aged between 15 and 24. It is usually transmitted through sexual activity with an infected individual, especially through unprotected sex. Chlamydia can easily go unnoticed, and therefore undiagnosed. This is because about 50% of men don’t show any symptoms, and almost 70% of women don’t show symptoms.


As well as chlamydia, gonorrhoea is one of the most common STIs in the world today Gonorrhoea is caused by a bacterium called Neisseria gonorrhoeae. Gonorrhoea is most common among the ages of 15 to 24. Gonorrhoea is most often transmitted through sexual activity with someone already infected with the disease, especially through unprotected sex. Symptoms do not always occur, but when they do they usually occur within 10 days of contracting the disease, although they can take up to 30 days to show up.


Syphilis is contracted by coming into direct contact with a “syphilis sore” during sexual activity, especially unprotected sex Syphilis is caused by a bacterium called Treponema pallidum. Syphilis can occasionally be passed to a person through kissing, but it is rare. These sores can be located on the genitalia, the anus or the lips and mouth. Symptoms of syphilis are divided into different stages: primary, secondary, latent and late syphilis. There are a huge number of symptoms related to syphilis, all of which are easily mistaken for other illnesses. For this reason syphilis is also known as “the great imitator”. The painless sores you contract, for example, can be mistaken for a small cut or even an ingrown hair. A non-itchy rash can develop on the palms of the hands and soles of the feet, all over the body, are in just a few places on the body during the secondary stage of the infection. Ocular syphilis affects the eye, and can cause blindness if left untreated.