The largest study of coronavirus patients so far suggests it could take up to 24 days after exposure for symptoms to show

wuhan coronavirus stopping the spread

The coronavirus outbreak that originated in Wuhan, China, has killed at least 1,370 people and infected more than 60,000.
New research from a group of Chinese scientists suggests the virus’ incubation period could be as long as 24 days.
Currently, the CDC says the coronavirus’ incubation period — the time between exposure and the onset of symptoms — is between two days and two weeks.
Based on that estimate, the CDC instituted a 14-day federal quarantine for the US citizens evacuated from Wuhan. The new study raises doubts about whether that time period is sufficient.
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The novel coronavirus that originated in Wuhan, China, in December has infected more than 60,000 people and spread to 25 other countries.

As researchers race to learn more about the virus, a crucial question lingers: How much time passes between when a person gets infected and when their first symptoms appear?

“Every day there are new estimates coming out for the incubation period,” Lauren Ancel Meyers, a professor of integrative biology at the University of Texas at Austin, told Business Insider.

According to the Centers for Disease Control and Prevention (CDC), the incubation period is believed to be between two and 14 days.

But new research from a group of Chinese scientists led by Zhong Nanshan, who discovered SARS, suggests it might take patients as long as 24 days to start showing symptoms after being exposed to the virus. The study examined 1,099 coronavirus cases from 522 hospitals across 31 provinces in China, making it the largest coronavirus case study to date, though it has not yet been peer-reviewed.

Meyers said uncertainty about the incubation period “is particularly relevant when you’re thinking about how long you actually have to monitor people to make sure that they’re not infected.”

So far, the US and many other countries have been formulating quarantine rules based on a 14-day incubation period.

US citizens evacuated from Wuhan were brought to military bases in nine states, including California and Texas, where they were put under a mandatory 14-day quarantine. On Tuesday, 195 of those evacuees were permitted to leave the March Air Reserve Base in Riverside, California, marking the first successful US quarantine in nearly 60 years.

The UK, Australia, France, India, Italy, and Canada have also announced that citizens repatriated from Wuhan will be quarantined for 14 days. And on Monday, the UK government announced measures allowing for the mandatory 14-day quarantine of coronavirus patients.

“It’s widely accepted that there’s a 14-day rule of thumb,” Stephen Morse, an epidemiologist at Columbia University told Business Insider. “That’s how long you have to wait to go back to your daily life.”

But if this new study is correct, 14 days may not be sufficient.

Is a 14-day quarantine long enough?

According to the new study from Nanshan’s team, the average age of infected patients was 47, and the average incubation period was three days. But the full range of incubation periods in …read more

Source:: Business Insider – Science

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