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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, April 2: At least three people have been arrested by police in connection with the attack on ASHA worker Krishnaveni in Bengaluru's Byatarayanapura area.

Earlier in the day, Bengaluru Police Commissioner Bhaskar Rao said that an investigation was initiated into the incident in which ASHA workers were attacked.

"I have appointed Pulikeshi Nagar ACP, Tabarak Fathima, to investigate the matter. A case will be registered and action will be taken. ASHA workers will be protected by the police to carry out their functions," Rao told ANI here.

Earlier, Karnataka Deputy Chief Minister CN Ashwath Narayan visited one of the ASHA workers who was allegedly attacked by unidentified miscreants and termed the incident as "completely demoralising" for the workers.

ASHA workers, who were deployed to spread awareness about coronavirus and identify suspected cases, were allegedly attacked by a group of locals in Byatarayanapura here on Wednesday.

The workers said that the locals did not allow them to work and around 100 people gathered at the spot and harassed them.

This comes as the country is under a 21-day lockdown to prevent the spread of coronavirus.