Omicron has proved to be not only staggeringly infectious, but also an evolutionary marvel, challenging many assumptions virologists had before the pandemic.
As the country enters its fourth holiday season with COVID-19, experts offer advice about how Americans should navigate the risks and what precautions still make sense.
Policymakers rely on models during uncertain times to figure out how their choices could affect the future. Over the pandemic, an ensemble of many COVID-19 models outperformed any one alone.
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