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This is called the menstrual cycle. The blood comes from the lining of the uterus, which is shed through the vagina. When this happens, a new reproductive cycle ...
They are spread mainly by sexual contact. STIs are caused by bacteria, viruses or parasites. A sexually transmitted infection may pass from person to person in ...
Testing for an STD or sexually transmitted infection in someone who doesn't have symptoms is called screening. Most of the time, STI screening is not a routine ...
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