Vaccines effective against delta variant, experts say

It is possible, for example, that people who choose not to get vaccinated are more likely to experience situations where they could be exposed to the virus. On the other hand, older people may be more likely to be vaccinated, but also have a harder time defending themselves against an aggressive variant. Or an outbreak may affect a part of a country where most people are vaccinated, leaving under-vaccinated regions unharmed.

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