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What Is a Second Wave of a Pandemic, and Could It Happen for COVID-19?: Media

Some pandemic diseases re-emerge in different segments of populations and spread anew, giving rise to a second—and sometimes deadlier—wave of disease

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SARS-CoV-2 virus particles
Colorized microscopic image of an apoptotic cell (purple) heavily infected with SARS-CoV-2...
Courtesy, NIAID