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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, May 23: SSLC and PUC students residing in containment zones will not be able to write the exams scheduled to be held in June and July, respectively, but will be given opportunity to write the supplementary examination and treated as fresh candidates.

Primary and Secondary Education Minister S. Suresh Kumar announced this at a press conference on Friday.

In turn, officials in the Department of Primary and Secondary Education will start collecting the list of students in containment zones. However, they are worried since the list of containment zones is dynamic and a particular locality can be declared a containment zone even the night before the examination.

“If any examination centre is located in the containment zone, then we can change the centre and move it to a non-containment zone. However, if a student resides in a zone that is declared containment zone just before the exam, there is no option but for the person to skip the exam,” an official said.

Officials of the department are worried about another scenario as well. “There is a chance that midway through the examination, an area is becomes a containment zone. Then some students may write a few papers and give the rest a miss. Implementation at the district- and block-levels will be a challenge,” said an official.

Sources said that the department is working out several situations that may arise and trying to work on providing practical solutions to the students.

Around 5.98 lakh students have registered for the second pre-university English examination that is scheduled to be held on June 18. As many as 8.48 lakh students have registered for the SSLC examination scheduled to be held between June 25 and 4 July. Currently, there are 261 containment zones in Karnataka that have 5.49 lakh people residing in these zones.

Meanwhile, the Karnataka Secondary Education and Examination Board has decided to ensure that only 18 students are seated in a classroom to write the SSLC examination. This is to ensure that social distancing is maintained in the exam hall.