The chickenpox vaccine protects against the varicella zoster virus that causes chickenpox. The chickenpox vaccine is not part of the routine childhood vaccination schedule. It is currently only offered on the NHS to people who are in close contact with someone who is particularly vulnerable to chickenpox or its complications.
It's been shown that 9 out of 10 children vaccinated with a single dose will develop immunity against chickenpox. Having 2 doses is recommended, as this gives an even better immune response.
The vaccination is not quite as effective after childhood. It's estimated that three-quarters of teenagers and adults who are vaccinated will become immune to chickenpox.
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