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This lesson covers sexually transmitted infections (STIs) as required by the Edexcel GCSE Combined Science specification (1SC0). You need to understand what STIs are, how they are spread, and the specific examples of HIV and chlamydia, including methods of prevention and reducing spread.
Sexually transmitted infections (STIs) are infections that are spread through sexual contact (vaginal, oral or anal sex). They are caused by pathogens — bacteria, viruses or other microorganisms — that are passed from one person to another during intimate physical contact.
STIs are a significant public health concern worldwide. Many STIs can be prevented through simple measures, and early treatment can prevent serious complications.
HIV was covered in detail in the previous lesson on viruses, but here we focus on it as an STI.
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