The highly transmissible delta variant of COVID-19 might be one of the most contagious diseases in recent history, according to a top epidemiologist who worked with the World Health Organization to help eradicate smallpox.
The highly transmissible delta variant of COVID-19 might be one of the most contagious diseases in recent history, according to a top epidemiologist who worked with the World Health Organization to help eradicate smallpox.
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