Reference Terms
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Sexually transmitted disease
Sexually transmitted diseases (STDs) also known as sexually transmissible diseases, sexually transmitted infections (STIs) or (infrequently) venereal diseases (VD), are diseases or infections that have a significant probability of transmission between humans by means of sexual contact. Depending on the STD, a person may or may not still be able to spread the infection if no signs of disease are present. For example, a person is much more likely to spread herpes infection when blisters are present (STD) than when they are absent (STI). However, a person can spread HIV infection (STI) at any time, even if he/she has not developed symptoms of AIDS (STD).
All sexual behaviors that involve contact with another person or the bodily fluids of another person should be considered to contain some risk of transmission of sexually transmitted diseases.
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May 29, 2026
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Latest Headlines
updated 12:56 pm ET
May 27, 2026 A drug combo widely explored for anti-aging may actually damage the brain, according to new mouse research showing severe loss of myelin and changes linked to “chemo brain.” Surprisingly, the ...
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May 27, 2026 Vitamin B12 has long been seen as a health hero, helping the body make red blood cells, repair DNA, and keep nerves functioning properly. But scientists are discovering that the story may be more ...
May 27, 2026 Scientists in Japan have created powerful new vitamin K-based compounds that may help the brain regenerate lost neurons — a breakthrough that could one day change how diseases like Alzheimer’s ...
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