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Chinese authorities have placed Wuhan, a city of 11 million people, under strict quarantine to stop the spread of the deadly Wuhan coronavirus.

The Wuhan coronavirus is named after the city where the first fatal case was reported. The Wuhan virus is now categorized as an epidemic after the death toll quadrupled overnight.

The virus that causes a deadly type of pneumonia has spread around the world from ground zero in Wuhan city. The CDC confirmed America's first case of Wuhan coronavirus in Washington state.

America, Asia and Europe authorities have canceled planes and trains and screened travelers for the virus. The World Health Organization (WHO) is considering declaring an international emergency.

Chinese authorities shut down public transportation in Wuhan and urged people not to travel to or from Wuhan. The emergency measures were set to take effect at 10 a.m. local time.

Officials said quarantining the city was necessary to "effectively cut off the transmission of the virus, resolutely curb the spread of the epidemic, and ensure the safety and health of the people."

Officials used television, radio and Twitter.com to spread the word that Wuhan and its population were under quarantine. The hashtag #WuhanLockdown was the top trending topic on Twitter.

Stock photo by Getty Images

Sales of surgical masks have skyrocketed in Asian countries.

Citizens of Wuhan took to Twitter to express concern about what would happen to them if they are under quarantine and unable to leave the city.

"Who will think of the lives of those of us who are healthy in Wuhan? We are also afraid," wrote one Twitter user.

"Even before the city was closed, we protected ourselves and hid at home. Now we are lambs who will still be slaughtered, and we can only leave our fates to the heavens."

Others wondered how sick residents would get from their homes to hospitals without public transportation.

Coronaviruses were first identified in the 1960s from nasal swabs of people who had the common cold.

But the new coronavirus leaped from fish and animals to humans. The virus is easily spread via air, replicates rapidly in the lungs and overwhelms the respiratory system.

One critical patient was placed on a heart and lung machine to bypass their lungs until they recovered from the disease.

Photo by D76 Masahiro Ikeda

The Centers for Disease Control and Prevention (CDC) confirmed the first case of Wuhan coronavirus in the United States.

The CDC announced that a man has been diagnosed with the deadly pneumonia virus in Washington state.

The first cases of the deadly coronavirus were reported in China.

CDC officials said the patient recently traveled to Wuhan, the Chinese city where the respiratory infections began.

At least six people have died and hundreds more are sickened by the mysterious virus. The virus is very contagious and spreads easily from human to human. Sales of disposable masks have skyrocketed.

Human coronaviruses were first identified in the 1960s in cultures taken from nasal swabs of patients with the common cold.

The CDC and Chinese officials report that the new coronavirus leaped from fish and animals to humans. Only seven known coronaviruses infect humans, including the well-publicized SARS outbreaks.

The outbreak has spread to three other Asian countries -- Japan, South Korea and Thailand.

Major airlines are screening passengers for symptoms of the coronavirus before they board commercial jets.

Planes are delayed and travelers wait in long lines at New York's JFK Airport and airports in Los Angeles and San Francisco to be screened for the virus.

Stocks on Wall Street are trading near session lows on the news that the mystery virus is spreading to other countries.

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