Contagious: Sexually Transmitted Diseases


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About contagion: Contagion and contagiousness refers to how easily the spread of Sexually Transmitted Diseases is possible from one person to another. Other words for contagion include "infection", "infectiousness", "transmission" or "transmissability". Contagiousness has nothing to do with genetics or inheriting diseases from parents. For an overview of contagion, see Introduction to Contagion.

Contagion summary: STDs may be spread by various types of sexual behavior. Many are spread by secretions; some are spread simply by the close physical contact from sex. Many STDs are spread by other methods such as by blood and mother-to-fetus or mother-to-child.


Contagiousness properties of Sexually Transmitted Diseases:
  Contagious overall?: Yes, STDs spread by various means including sexual.
  Contagious by sex?: Yes
  Contagious by oral sex?: Yes
  Contagious by anal sex?: Yes
  Contagious by vaginal sex?: Yes
  Contagious even with safe sex?: Yes, in some cases.
  Contagious from blood?: Yes, some STDs
  Contagious from blood transfusion?: Yes, some STDs
  Contagious from intravenous needle usage?: Yes, some STDs
  Contagious from needlestick injury?: Yes, some STDs
  Contagious from organ transplant?: Yes, some STDs
  Contagious from mother to fetus (transplacental)?: Yes, some STDs
  Contagious mother to baby during childbirth?: Yes, some STDs

Contagion discussion: STDs can be transmitted from a pregnant woman to the fetus, newborn, or infant before, during, or after birth.  Some STDs (like syphilis) cross the placenta and infect the fetus during its development. Other STDs (like gonorrhea, chlamydia, hepatitis B, and genital herpes) are transmitted from the mother to the infant as the infant passes through the birth canal.  HIV infection can cross the placenta during pregnancy, infect the newborn during the birth process, and, unlike other STDs, infect an infant as a result of breast-feeding. 1

Footnotes:
1. excerpt from STDs and Pregnancy: DSTD

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