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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.

May 30: A Delhi court on Saturday granted interim bail for 10 days to former municipal councillor from the Congress Ishrat Jahan, who has been booked under the stringent Unlawful Activities (Prevention) Act, to get married.

She has been booked under the anti-terror law in a case related to communal violence in northeast Delhi in February.

Additional Sessions Judge Dharmender Rana granted the interim relief from June 10 to June 19 to Jahan on furnishing two sureties of Rs 1 lakh.

The court directed her not to tamper with any evidence or influence the witnesses in the case.

According to the interim bail plea, filed through advocates S K Sharma and Lalit Valeecha, Jahan's marriage was fixed in 2018 for June 12, 2020.

The plea further said that Jahan would not tamper with any evidence or influence the witnesses if granted bail.

The petition, also filed through advocates Tushar Anand and Manu Prabhakar, claimed that Jahan has been falsely implicated in the case.

It alleged that upon bare perusal of the contents of the FIR, no incident of violence can be attributed to her and the wild and baseless allegations made against her were not only irresponsible and false, but also caused serious harm to her reputation.

Jahan, who is also an advocate, was only a supporter of ongoing peaceful protests and it was one of the fundamental rights of the citizens to protest and register their dissent against any unreasonable measure of the government, the plea said.

Besides Jahan, Jamia Millia Islamia University students Asif Iqbal Tanha, Gulfisha Khatoon, Jamia Coordination Committee members Safoora Zargar, Meeran Haider, president of Jamia Alumni Association Shifa-Ur-Rehman, suspended AAP councillor Tahir Hussain, activist Khalid Safi, JNU student Natasha Narwal and former student leader Umar Khalid have also been booked under the anti-terror law in the case.

The police had claimed in the FIR that Khalid and his associates had instigated people to start riots in the area and it was a "premeditated conspiracy".

Communal clashes had broken out in northeast Delhi on February 24 after violence between citizenship law supporters and protesters spiralled out of control, leaving at least 53 people dead and around 200 injured.