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Sexually transmitted infections (STIs) are a serious public health issue. It’s estimated that globally, more than a million people are diagnosed with one or more STI, such as gonorrhoea, chlamydia or syphilis, every day. What’s more concerning is that the prevalence of infection with chlamydia, for example, has remained unchanged over the past 10 years despite better screening in developed countries.
As the name suggests, STIs are spread mainly through sexual contact. This includes vaginal, anal and oral sex; some infections can also be spread by non-sexual means, for example, from mother to child during pregnancy or childbirth.