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Coronavirus: All you need to know about symptoms and risks

China is stepping up efforts to tackle a new coronavirus that is thought to have originated in a Wuhan seafood market.

At least 17 people have died from a new coronavirus in China following an outbreak in the central city of Wuhan, and more than 550 cases have been reported globally.

Most cases are in China, where more infections have been confirmed in recent days.

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There are growing concerns about the spread of the virus as hundreds of millions of people travel for the Lunar New Year celebrations, which start on Friday.

Here is what you need to know: 

What is coronavirus?

According tothe World Health Organization, coronaviruses are a family of viruses that cause illness ranging from the common cold to more severe diseases such as Middle East respiratory syndrome (MERS) and severe acute respiratory syndrome (SARS).

These viruses are transmitted between animals and people. SARS, for instance, was believed to have been transmitted from civet cats to humans while MERS travelled from a type of camel to humans.

Several known coronaviruses are circulating in animals that have not yet infected humans.

A novel coronavirus, identified by Chinese authorities on January 7 and currently named 2019-nCoV, is a new strain that had not been previously identified in humans.

Little is known about it, although human-to-human transmission has been confirmed.

What are the symptoms?

According to the WHO, signs of infection include respiratory symptoms, fever, cough, shortness of breath and breathing difficulties.

In more severe cases, it can lead to pneumonia, severe acute respiratory syndrome, kidney failure and even death.

How deadly is it?

Some experts say it may not be as deadly as other types of coronavirus such as SARS, which killed nearly 800 people worldwide during a 2002-2003 outbreak that also originated from China.

MERS, which did not spread as widely, was more deadly, killing a third of those it infected.

Where have cases been reported?

Mostly in China.

Chinese officials said at least 17 people have died, all in Hubei Province, of which Wuhan is the capital. That is also where most of the 571 reported cases are.

Beyond China, Thailand has reported four cases, while South Korea, Taiwan, Japan and the United States have each confirmed one.

All the cases involve people who had either come from Wuhan or been there recently.

What is being done to stop it spreading?

There is no vaccine for the new virus.

Chinese authorities effectively sealed off Wuhanon Thursday, suspending flights and trains out of the city and telling residents they could not leave without a special reason, state media said.

The move, effective at 10am (02:00 GMT), is meant to “resolutely contain the momentum of the epidemic spreading” and protect lives, the central city’s special command centre against the virus said, according to state broadcaster CCTV.

Chinese authorities have stepped up monitoring and disinfection efforts ahead of the Lunar New Year break, which formally starts on Friday and is when many of the country’s 1.4 billion people will travel domestically and overseas.

Airport authorities across Asia, including Japan, Hong Kong, Thailand, Singapore, South Korea and Malaysia quickly stepped up screening of passengers from Wuhan.

In Europe, the United Kingdom and Italy have said they will introduce enhanced monitoring of flights from Wuhan, while Romania and Russia are also strengthening checks.

Some airports in the United States have also begun checks.

Where did the virus originate?

Chinese health authorities are still trying to determine the origin of the virus, which they say came from a seafood market in Wuhan where wildlife was also traded illegally. The WHO also says an animal source appears most likely to be the primary source of the outbreak.

There is evidence of respiratory transmission of the virus from patient to patient and Chinese authorities have also said 15 medical staff in the country have been infected.

Experts particularly worry when health workers get sick during new outbreaks because this can suggest the disease is becoming more transmissible and because spread in hospitals can often amplify the epidemic.

What next?

On Thursday, the WHO is expected to announce its decision on whether to declare a global public health emergency in relation to the new coronavirus.

SOURCE: AL JAZEERA AND NEWS AGENCIES

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