Authorities in China's financial hub of Shanghai have quarantined 186 people and conducted virus tests on more than 8,000 after a freight handler at the city's main international airport tested positive for the coronavirus.To get more news about shanghai coronavirus cases, you can visit shine news official website.

The city government said on its microblog Tuesday that it remains unclear how the 51-year-old man contracted the virus, which has largely spared the sprawling metropolis despite its dense population and strong international links. It says no additional cases have been found.

In China's northern port city of Tianjin, more than 77,000 people have been tested after a locally transmitted case was reported there Monday. That case was believed to be linked to a cold storage warehouse, reinforcing suspicions that the virus may be spreading to victims from frozen food packaging.North Dakota's governor says health care workers who have tested positive for the coronavirus but have no symptoms should be allowed to stay on the job as part of an effort to ease the stress on hospitals and medical personnel dealing with the pandemic.

Gov. Doug Burgum said Monday the CDC allows such personnel to keep working as long as they take precautions.

Burgum says leaders from the six major hospitals in the state will meet daily to discuss hospital space and staffing, with the likelihood of shifting personnel among them. Some hospitals are suspending some elective surgeries.

The governor also announced that every county in the state has been declared at high risk, so businesses will be limited to 25% capacity. He says masks "should be required."Pfizer's senior vice president of drug safety says the timing of the company's announcement was of progress in its coronavirus vaccine was not related in any way to the presidential election and was made as soon as the efficacy data was ready.

John Burkhardt told reporters Monday that no corners were cut, but the company broke with standard practice and has been manufacturing the vaccine even as the vaccine goes through the approval process.

He says that "normally, you wouldn't spend $1 billion to manufacture a product that may not work. You wait and see whether it works and whether it's safe and then you do the manufacturing. So we did that at risk. That was a decision that was made very early in the process."Two more Iowa prisons are reporting outbreaks of coronavirus infections.

The Iowa Department of Corrections says testing has revealed outbreaks at prisons in Clarinda, where 377 inmates and 16 staff members are positive, and Rockwell City, where 254 inmates and four staff members are positive. The Clarinda prison has about 900 inmates and Rockwell City has 426.

The department released data Friday showing an outbreak at the Anamosa prison and updated numbers show 485 infected inmates of the 982 inmates at the prison. An additional 50 staff members tested positive.

Additional smaller prison outbreaks also have been reported. In total, 1,145 inmates and 103 staff members are positive in Iowa's prisons.