5 things we know and still don't know about COVID, 5 years after it appeared Five years after the virus that causes COVID emerged in China it still holds some mysteries. The disease has killed an estimated 20 million people globally, according to the World Health Organization, and thousands are still dying every year. AP News

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The virus is still with us, though humanity has built up immunity through vaccinations and infections. It’s less deadly than it was in the pandemic’s early days and it no longer tops the list of leading causes of death. But the virus is evolving, meaning scientists must track it closely.

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