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A CORONAVIRUS expert fears a mystery new outbreak hitting China is a mutant strain of the deadly bug that leaves sufferers sick for even longer.

Worryingly, the strain is behaving differently in patients in northeast China where five million people across two cities are virtually sealed off following spiralling new infections.

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 Chinese commuters wear protective masks as they wait to cross an intersection
Chinese commuters wear protective masks as they wait to cross an intersectionCredit: Getty Images - Getty

Dr Qiu Haibo, an expert in critical care medicine at the National Health Commission, told reporters new clusters of infections in the northeastern border provinces of Jilin and Heilongjiang in recent weeks were raising concern about a second wave.

The prominent doctor said there are signs that the bug is changing as it spreads again in China.

Patients in the northeastern clusters are carrying the virus for longer than earlier cases in Wuhan - the world's original, infamous epicentre - before they show symptoms.

Plus, those infected by the mutated strain were taking far longer to recover.

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Qiu told state broadcaster CCTV on Tuesday: “This causes a problem, as they don’t have any symptoms.

“So when they gather with their families they don’t care about this issue and we see family cluster infections.”

They rarely had a high temperature, and tended to suffer damage to the lungs rather than across multiple organs, he added.

The expert said it appeared the changed bug had been imported from abroad.

He did not say where he believed the mutant strain started, but both Jilin and Heilongjiang border Russia, which has reported a huge outbreak in recent weeks.

 The cities of Jilin and Shulan have both been hit with new measures
The cities of Jilin and Shulan have both been hit with new measures

Fears of a mutant strain come as the cities of Jilin and Shulan, both in the northwestern province Jilin, have been hit with severe clampdowns.

Six officials - one from Shulan and five from Jilin - have been removed from their posts following the emergence of local infection clusters, say reports.

Shulan, a city with a population of 600,000 people, has banned residents from leaving their homes in compounds with confirmed or suspected COVID-19 cases.

Jilin has also sealed off one of its districts after upgrading the area's emergency level to "high-risk."

The city, with a population of 4.4million, has announced new Wuhan-style lockdown measures and closed schools following a cluster of infections.

 China has ordered millions of tests are carried out over fears of a second outbreak
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China has ordered millions of tests are carried out over fears of a second outbreakCredit: EPA
 A masked driver is stopped at a police road check in city of Jilin
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A masked driver is stopped at a police road check in city of JilinCredit: AFP or licensors

Officials put Fengman District on high alert after recording more new locally-transmitted cases and at least one additional death.

The restrictions include bans on all outbound foot and vehicle traffic, as well as the closure of schools and entertainment venues such as cinemas, gyms and restaurants.

Residential districts have been put on closed management, with each household allowed to send one member to shop for essentials once a day.

Residents who break the rules will be banned from leaving their homes completely.

China’s official total number of coronavirus infections stands at 82,965, while the death toll is 4,634.

Today, it began its most important political event of the year after a two-month delay because of the coronavirus pandemic.

It opened the annual session of the Chinese People’s Political Consultative Conference, attended by 2,000 delegates.

Chairman Wang Yang said members would “tell the world about how China, as a responsible major country, has taken firm action and contributed to international cooperation in the fight against the Covid-19 epidemic."

According to Worldometers, more than 5.1million have contracted the bug, while 330,255 people have died from coronavirus across the globe.

 A medical worker takes a swab from a worker for a coronavirus test at a factory in Wuhan, China
A medical worker takes a swab from a worker for a coronavirus test at a factory in Wuhan, ChinaCredit: EPA
Coronavirus scientists are tracking eight unique strains of the deadly COVID-19
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