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Sexually transmitted infections (STIs)

An STI is an infection mainly passed on through sexual contact. Many STIs cause no symptoms. Testing, appropriate treatment, partner notification and safer sex prevent complications and further transmission.

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An STI is an infection mainly passed on through sexual contact. Many STIs cause no symptoms. Testing, appropriate treatment, partner notification and safer sex prevent complications and further transmission.

  • Often no symptoms at all.
  • Discharge from the penis, vagina or anus, burning urination or more frequent urgency.
  • Get tested at all relevant body sites and follow advice about timing.
  • Complete the full course and do not share medicines.
  • Make contact promptly after unprotected sex with a high HIV risk; PEP works only when started in time.
  • For urgent GP care outside normal opening hours, call HAP 9252. Call Ambulance 912 only for an immediately life-threatening situation.

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Further reading

Browse A–Z
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ChlamydiaChlamydia is a common sexually transmitted infection caused by the bacterium Chlamydia trachomatis. It often causes no symptoms. Testing provides clarity and treatment reduces the chance of complications and further spread.
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CondomsWhen used correctly, condoms reduce the likelihood of pregnancy and many sexually transmitted infections. Use a new condom for every sexual act, from the first genital contact. If it tears or slips off, prompt assessment may be needed for emergency contraception, STI tests or HIV PEP.
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Genital herpesGenital herpes is a common infection caused by the herpes simplex virus. The first outbreak may be painful, with blisters, sores or burning, but many people have mild symptoms or none at all. You can pass on the virus without visible blisters too. Herpes needs extra attention during pregnancy because a newborn baby can become seriously unwell.