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Sign up for a free Medical News Today account to customize your medical and health news experiences. Some STDs can spread through the use of unsterilized drug needles, from mother to infant during childbirth or breast-feeding, and blood transfusions. The genital areas are generally moist and What causes sexual transmitted disease environments, ideal for the growth of yeasts, viruses, and bacteria. People can transmit microorganisms that inhabit the skin or mucous membranes of the genitals.
Infectious organisms can also move between people in semen, vaginal secretions, or blood during sexual intercourse. Individuals pass on STDs more easily when they are not using contraceptive devices, such as condoms, dams, and sanitizing sex toys.
Some infections can transmit through sexual contact but are not classed as STDs. For example, meningitis can be passed on during sexual contact, but people can acquire a meningitis infection for other reasons.
It is therefore not classed as an STD.