The three major blood-borne viruses, human immunodeficiency virus (HIV), hepatitis B virus (HBV) and hepatitis C virus (HCV), are members of different virus families but have one thing in common: their major mode of transmission is via blood or bodily fluids. Sexually transmitted infections (STIs) are a diverse group of infections caused by widely differing micro-organisms (viruses, protozoa, bacteria, yeasts, ectoparasites and even a nematode), whose common characteristic is that they are transmitted from person to person by sexual contact such as deep kissing, vaginal sex, anal sex, oral sex, oro-anal sex or just close intimate physical contact.
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