How many strains of chickenpox are there?
Chickenpox is caused by the varicella-zoster virus (VZV). There are three known strains of VZV:
* Wild-type VZV: This is the most common strain of VZV and is responsible for most cases of chickenpox.
* Vaccine-type VZV: This is a weakened strain of VZV that is used in the chickenpox vaccine.
* Oka strain: This is a highly attenuated strain of VZV that is used in some chickenpox vaccines.
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