Physicians have compared coronavirus to the 2003 outbreak of severe acute respiratory syndrome, which had a short incubation period of two to seven days. At the time, World Health Organization officials said it was less infectious than the flu. While there were just eight confirmed cases in the U.S., it infected 8,098 people worldwide and killed 774.
SARS, however, didn't spread as fast in its first few weeks as the coronavirus, according to WHO data. It took almost two months for SARS to spread to 456 people. By comparison, the 2019 coronavirus has already infected more than 900 people in less than a month.
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