A coronavirus carrier has concealed her symptoms and flown from Los Angeles to Beijing to seek treatment in China.

The Chinese woman, who lives in the US with her family, claimed to have been denied the coronavirus test three times by American doctors before resorting to the drastic measure, said officials in Beijing.

She gobbled down anti-fever medicine in the airport before boarding the 13-hour flight with her husband and son, authorities claimed.

A Chinese woman (not pictured) has flown 13 hours from Los Angeles to Beijing to seek coronavirus treatment, officials said. Pictured, passengers wearing face masks and raincoats walk through a nearly empty departure hall at Beijing Capital International Airport on March 9

The pandemic has killed more than 6,640 people and infected over 173,000 around the world

The patient, known by her surname Li, was said to be diagnosed with the coronavirus on Friday hours after she arrived in the Chinese capital.

She is being treated in quarantine. Her husband and son are under medical observation in isolation.

Police have launched an investigation into Ms Li.

According to Beijing's officials, Ms Li and her family are long-term residents of Massachusetts.

She said that she started to experience a series of coronavirus symptoms, including chills, fevers, coughs and runny nose, from March 1 after one of her colleagues was diagnosed.

She went to a local hospital on March 3 and was given anti-viral medication. She underwent X-ray checks of her lungs during two subsequent visits to the same hospital and the results showed no abnormality.

But on March 11 when she visited the hospital again, her scan indicated she had pneumonia.

The Chinese woman flew from Los Angeles to Beijing on March 12 with her husband and their son to seek medical attention, according to Beijing officials. Pictured, an international traveller wearing a facemask arrives at Los Angeles International Airport (LAX) on March 12

Coronavirus fears have gripped the United States with multiple cities going into lockdown. People are pictured walking by LA Live center in downtown Los Angeles on March 15

More than 3,800 people have been infected and at least 69 have died of the virus in the US

Ms Li said the hospital refused to admit her.

She also claimed that she had applied to take coronavirus tests three times in the US, but all of her applications had been rejected.

To receive further treatment, Ms Li took Air China flight CA988 to travel to Beijing from Los Angeles on March 12.

During the flight, she told flight attendants that she suffered from low blood pressure and stewards arranged her to sit at the back of the cabin.

Upon her arrival in Beijing, she was taken to the hospital, together with her husband and son, after claiming to suffer fevers, muscle weakness and coughs on her health declaration card.

Her husband claimed to experience muscle weakness too, but their son had no symptoms.

A woman wearing a protective mask walks outside a mall in Manila, Philippines, on Monday

A vendor pushes his food cart down an empty street near Times Square in New York on Sunday

Ma's donation comes as China and US spar over the birthplace of the killer infection. In the picture, a pedestrian wearing a face mask stops in Times Square in New York on March 12

A mask-wearing costumed character are pictured in New York Times Square on March 12

A commuter wears a face mask while riding a nearly empty subway car into Brooklyn Thursday

According to a statement from Beijing police, Ms Li took anti-fever medicine before boarding her plane and then failed to inform the flight attendants of her health condition with honesty.

Police are probing her on suspicion of preventing the control of infectious diseases.

A total of 59 people have been quarantined after coming into close contact with her, the police said.

Ms Li's case was revealed at a press conference on Saturday by Pang Xinghuo, the deputy director of the Centre for Disease Control and Prevention of Beijing.

Chinese Foreign Ministry spokesman Zhao Lijian (left) said the U.S. lacked transparency and accused American military members of bringing the coronavirus to Wuhan. It came after U.S. National Security Adviser Robert O'Brien said the speed of China's reaction to the emergence of the coronavirus had probably cost the world two months when it could have been preparing for the outbreak

It came as China tries to deflect blame for the contagion and reframe itself as a country that took decisive steps to buy the world time by placing huge swathes of its population under quarantine.

It also came after China and the United States blamed each other as the alleged origin of the killer infection.

A Beijing spokesperson last week claimed that the coronavirus might have been brought to Wuhan by the US military while US politicians called it the 'Wuhan virus' or 'Chinese coronavirus'.

More than 100 countries in the world are now fighting the coronavirus outbreak, with its epicentre shifting from China's Hubei Province to Europe.

More than 2,300 people have died of the coronavirus and over 57,000 have fallen ill in Europe

An picture shows the border crossing between Poland and Ukraine in Korczowa on Sunday

A man wearing a face mask stands on the Poland-German border crossing point on Sunday

Global deaths and infections have overtaken those inside China for the first time since the beginning of the outbreak in December.

More than 90,000 people outside China have been infected by the virus, compared to 80,955 in China.

While over 3,400 international fatalities have occurred in comparison to 3,213 deaths reported by Beijing.

So far, the coronavirus pandemic has killed more than 6,640 people and infected over 173,000 around the world.