Causes of Zika virus

Learn about how Zika virus is spread.

How is Zika virus spread?

Zika virus is primarily spread though the bite of an infected mosquito. The mosquitoes that transmit Zika virus are the same as those that spread the chikungunya and dengue viruses.

The Zika virus can also be spread by:

  • sexual transmission through semen and vaginal fluids of infected persons
  • an infected, pregnant woman to her developing fetus
  • cell, blood and tissue donations from infected donors
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