Chickenpox is a virus that spreads easily to others. It creates a widespread, itchy rash. The infection can also cause serious complications in some people.

Chickenpox
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Chickenpox is caused by the varicella-zoster virus (VZV). It spreads from person to person via:

  • Airborne droplets of moisture containing the VZV virus
  • Direct contact with fluid from a chickenpox or zoster rash

It is contagious 1-2 days before the rash erupts. It remains contagious until all of the blisters have crusted. This takes 5 days. It is most contagious just after the rash has broken out.

A pregnant mother can transmit the virus to a fetus.