Study: One Dose of Chicken Pox Vaccine Not Enough A study in this week's New England Journal of Medicine finds that the chicken pox vaccine is less effective than previously thought. The results suggest that more than one dose of the vaccine may be needed. NPR's Patricia Neighmond reports.

Study: One Dose of Chicken Pox Vaccine Not Enough

Study: One Dose of Chicken Pox Vaccine Not Enough

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A study in this week's New England Journal of Medicine finds that the chicken pox vaccine is less effective than previously thought. The results suggest that more than one dose of the vaccine may be needed. NPR's Patricia Neighmond reports.