Why a Coronavirus Vaccine Might Fail People 50 and Older

People around the world are holding their collective breath, dreaming of the day a vaccine finally brings the coronavirus to its knees. Unfortunately, the reality is likely to be messier. Experts are divided about how quickly a vaccine might be ready and how effective it will be once it’s released. In addition, history suggests the vaccine might not work as well in older folks — the people most in…

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