Sexuallytransmitteddiseases (STDs) are caused by bacteria, viruses, protozoans, fungus, and parasites. Learn about symptoms in women and men, types, treatment guidelines, and testing. Get a list of STDs and find out which STDs are transmissible from kissing. Sexuallytransmitteddiseases are infections spread mainly by contact with genitals or bodily fluids. Also called STDs, STIs or venereal disease, sexuallytransmitted infections are caused by bacteria, viruses or parasites. Sexual activity includes genital touching or sexual intercourse. sexuallytransmitteddiseases and infections (STDs & STIs). Sexuallytransmitteddisease (STD) refers to a recognizable disease state that has developed from an STI (1). STIs can be caused by a number of microorganisms that vary widely in size, life cycle, susceptibility to available treatments, and the diseases and symptoms they cause. Shalaka illustrates about causes of STDs, sexuallytransmitteddisease, symptoms and what tests are conducted to diagnose STD such as HPV, genital warts ... Sexuallytransmitted infections (STIs) can develop into diseases when left untreated, potentially causing pelvic inflammatory disease (PID), genital or anal warts, and certain cancers including cervical, anal, and throat cancers. Sexuallytransmitted infections (STIs) are common and can be passed on during sex or through sexual contact. They can usually be treated at a sexual health clinic. Symptoms of a sexuallytransmitted infection (STI). Sexuallytransmitted infections (STIs) are infections that are passed from one person to another through sexual contact.