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What is your opinion regarding the chickenpox vaccine for children here in the UK? - chickenpox more condition_symptoms

If I understand the vaccine against chickenpox is not always available here in the United Kingdom. Part of the reason is given by the NHS, that exposure to varicella-zoster virus can enhance the immunity of adults.

1. Is this a good policy in the eyes of the medical experts? Are doctors, nurses, health professionals can have their say - that is would be very interested? Do you think it should be routinely offered as part of routine vaccination of children?

2. Can I still the vaccine to my son, my doctor?