Politico: “The evidence, compiled by federal scientists over the past several months, showed a decline in the initial round of protection against Covid-19 infection that’s coincided with a resurgence in cases driven by the more contagious Delta variant. The data looked at vaccine effectiveness in individuals across age groups, with varying medical conditions and who received the shot at different times.”
Washington Post: Rise of delta variant and waning immunity are fueling breakthrough infections.
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