How is chlamydia transmitted?

Updated: Sep 25, 2018
  • Author: Shahab Qureshi, MD, FACP; Chief Editor: Michael Stuart Bronze, MD  more...
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The bacterium is usually spread through sexual activity. An infected male has a 25% chance per sexual encounter of transmitting the infection to an uninfected female. Chlamydiae can be vertically spread as well. The transmission rate from infected mother to newborn is 50-60%, causing conjunctivitis (in most cases) or pneumonia (in 10-20% of cases; see Afebrile Pneumonia Syndrome).

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