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Washington, Jun 30: Researchers in China have discovered a new type of swine flu that is capable of triggering a pandemic, according to a study published Monday in the US science journal PNAS.

Named G4, it is genetically descended from the H1N1 strain that caused a pandemic in 2009.

It possesses "all the essential hallmarks of being highly adapted to infect humans," say the authors, scientists at Chinese universities and China's Center for Disease Control and Prevention.

The researchers then carried out various experiments including on ferrets, which are widely used in flu studies because they experience similar symptoms to humans -- principally fever, coughing and sneezing. 

G4 was observed to be highly infectious, replicating in human cells and causing more serious symptoms in ferrets than other viruses.

Tests also showed that any immunity humans gain from exposure to seasonal flu does not provide protection from G4.

According to blood tests which showed up antibodies created by exposure to the virus, 10.4 percent of swine workers had already been infected.

The tests showed that as many as 4.4 percent of the general population also appeared to have been exposed.

The virus has therefore already passed from animals to humans but there is no evidence yet that it can be passed from human to human -- the scientists' main worry.

"It is of concern that human infection of G4 virus will further human adaptation and increase the risk of a human pandemic," the researchers wrote.

The authors called for urgent measures to monitor people working with pigs.

"The work comes as a salutary reminder that we are constantly at risk of new emergence of zoonotic pathogens and that farmed animals, with which humans have greater contact than with wildlife, may act as the source for important pandemic viruses," said James Wood, head of the department of veterinary medicine at Cambridge University.

A zoonotic infection is caused by a pathogen that has jumped from a non-human animal into a human.

Bengaluru, Jul 9: Karnataka Chief Minister B S Yediyurappa on Thursday said the Covid-19 situation was “getting out of control a little” in some parts of the state, but assured citizens that authorities were taking necessary steps. 

“In some districts, it’s getting out of control a little. But the district administration and police are working day and night,” Yediyurappa said before the Cabinet meeting where the Covid-19 situation will be discussed. 

Speculation is rife that the government might consider stricter measures to curb the movement of people to try arresting the rising number of Covid-19 cases. 

Later in the day, Yediyurappa is slated to inspect the Bengaluru International Exhibition Centre, which has been converted into a Covid Care Centre with 10,000 beds. The chief minister said he had ordered “immediate” arrangement of more ambulances for Bengaluru, where cases are rapidly shooting up. 

“A team from the Centre had come. They’ve made some observations and they also appreciated us for some of the things we’ve done,” he added. 

On Friday, Yediyurappa has convened a meeting of all Bengaluru ministers, legislators, MPs and councillors to discuss the Covid-19 pandemic in the city.