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The deadly novel coronavirus outbreak has turned a spotlight on the science of disease, raising the question: What exactly is a pandemic? An outbreak is the occurrence of disease cases in excess of ...

(NEXSTAR) – On March 11, 2020, the director-general of the World Health Organization told the world that COVID-19 “can be characterized as a pandemic.” At the time, fewer than 4,500 people were ...

The Covid-19 pandemic has been perceived mainly as a dangerous acute outbreak of infection that killed more than a million people in the United States and 7 million worldwide. 1,2 However, in the ...