Answer Bank: What's the difference between epidemic and pandemic?

The World Health Organization (WHO) declared the novel coronavirus (COVID-19) a global pandemic on Wednesday, but before WHO had been using the term "epidemic." What does this mean?

According to the WHO official website, there are six classification stages describing the evolution process of a novel virus, from phase 1 with "no reports of animal influenza causing human infections" to phase 6 of "a pandemic."

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