The Coronavirus: What Scientists Have Learned So Far

By: By Knvul Sheikh and Roni Caryn Rabin
Source: www.nytimes.com
Website: https://www.nytimes.com/article/what-is-coronavirus.html

A respiratory virus that originated in China has infected more than 900,000 people worldwide, with at least 200,000 cases in the United States.
An intensive care unit treating coronavirus patients in a hospital in Wuhan, China, the virus’s epicenter.
An intensive care unit treating coronavirus patients in a hospital in Wuhan, China, the virus’s epicenter.
Knvul SheikhRoni Caryn Rabin

By Knvul Sheikh and Roni Caryn Rabin

April 30, 2020

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A novel respiratory virus that originated in Wuhan, China, last December has spread to six continents. Hundreds of thousands have been infected, at least 20,000 people have died and the spread of the coronavirus was called a pandemic by the World Health Organization in March.

Much remains unknown about the virus, including how many people may have very mild or asymptomatic infections, and whether they can transmit the virus. The precise dimensions of the outbreak are hard to know.

Here’s what scientists have learned so far about the virus and the outbreak.
What is a coronavirus?
ImageAn illustration released by the Centers of Disease Control showing the coronavirus, including its characteristic spikes on the outside of the virus, from which it gets its name.
An illustration released by the Centers of Disease Control showing the coronavirus, including its characteristic spikes on the outside of the virus, from which it gets its name.Credit...Lizabeth Menzies/Agence France-Presse — Getty Images

Coronaviruses are named for the spikes that protrude from their surfaces, resembling a crown or the sun’s corona. They can infect both animals and people, and can cause illnesses of the respiratory tract.

At least four types of coronaviruses cause very mild infections every year, like the common cold. Most people get infected with one or more of these viruses at some point in their lives.

Another coronavirus that circulated in China in 2003 caused a more dangerous condition known as Severe Acute Respiratory Syndrome, or SARS. The virus was contained after it had sickened 8,098 people and killed 774.

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Middle East Respiratory Syndrome, or MERS, first reported in Saudi Arabia in 2012, is also caused by a coronavirus.

The new virus has been named SARS-CoV-2. The disease it causes is called Covid-19.
How dangerous is it?

It is hard to accurately assess the lethality of a new virus. It appears to be less often fatal than the coronaviruses that caused SARS or MERS, but significantly more so than the seasonal flu. The fatality rate was over 2 percent, in one study. But government scientists have estimated that the real figure could be below 1 percent, roughly the rate occurring in a severe flu season.

About 5 percent of the patients who were hospitalized in China had critical illnesses.

Children seem less likely to be infected with the new coronavirus, while middle-aged and older adults are disproportionately infected.

Men are more likely to die from an infection compared to women, possibly because they produce weaker immune responses and have higher rates of tobacco consumption, Type 2 diabetes and high blood pressure than women, which may increase the risk of complications following an infection.

“This is a pattern we’ve seen with many viral infections of the respiratory tract — men can have worse outcomes,” said Sabra Klein, a scientist who studies sex differen

 

 

 

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