8784b9b1_unization_policy_for_providers__How_Often
[Immunization] Chickenpox [Why] Chickenpox can be a severe disease in adults. Child care providers are at high risk of being exposed to chickenpox in the child care setting. [How Often] 
Child care providers who know they have had chicken pox can assume they are immune. All other providers should consider getting vaccinated against chicken-pox because of the high risk of exposure to chickenpox. Persons who believe they have never had chickenpox or are unsure can be vaccinated. In some areas, blood tests may be available to determine if a person is susceptible and in need of vaccination.
Health History and immunization policy for providers
How Often