A super-spreader—a term we didn’t much use nine months ago—is a person with a contagious disease who gives it to a lot of other people. In the coronavirus pandemic, super-spreaders have played an outsize role. Scientists have identified super-spreaders who have infected dozens of people with the virus, while others with the illness haven’t infected anyone at all. Super-spreaders may explain why the coronavirus seems to take over so quickly in some places, but not in others.

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