By Washington Post Staff

What began with a handful of mysterious illnesses in a central China city has traveled the world. First detected on the last day of 2019, the novel coronavirus has killed more than 410,000 people with infections surpassing seven million worldwide. It has triggered nationwide lockdowns, stock market upheaval and dangerous conspiracy theories.

Most cases are mild, but health officials say much is still unknown about the virus that causes the disease covid-19.

The Washington Post has spoken to scores of doctors, officials and experts to answer as many of your questions as we can about the newest global health emergency. Here’s what we know so far.


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