What does it mean to be immune to varicella ?

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Varicella is chickenpox, because chickenpox is caused by the varicella-zoster virus (VZV).

Chickenpox causes a blister-like rash, itching, tiredness, and fever. It's very contagious.

Being immune to Varicella means you're unlikely to get infected by this VZV. Usually the immune comes from vaccination. It's a two-dose vaccine, quite common in U.S.