Sexually transmitted infections
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One of the most common STIs, gonorrhoea is easily passed on during sex.
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If left untreated Chlamydia can cause serious problems including infertility.
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Blisters are the main symptom of herpes, appearing within two weeks of infection.
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Hepatitis A, B and C have different symptoms and different ways of spreading.
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Usually caused by bacteria, non-specific urethritis (NSU) results in inflammation.
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Someone with syphilis may discover a rash on their palms or the soles of their feet.
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Caused by a virus living on the skin, genital warts may grow bigger and spread if untreated.
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Pubic lice are small crab-shaped insects that live on body hair.
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An increasing number of LGV infections are being seen among gay and bisexual men.