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Do you know which STIsSTI is the abbreviation for "sexually transmitted infections". Sometimes only the abbreviation STI is used in specialist circles or in brochures. (sexually transmitted infectionsThere are some infections that you can only or mainly contract if you have sex with someone who is infected with them. These can be bacteria, viruses, fungi or parasites. Not all STIs can be transmitted in the same way. Take a look at our o...) can be transmitted and when? Take the quiz here.