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.
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one day snake must come out from rat hole...that day we will wait
Dear DC Dr. Harsha, we want to know if you will take strict action on these anti nationals / rowdis / day robbers / terrorists who ransacked auto + beaten the auto driwer and stolen Rs. 10,000 from him though he was legally transporting the meat. They same terrorists are involved in transporting live animals to beef export houses in Gujrat owned by Brahmins / Jains. Will you be loyal to your duty and promise. We will see how you will handle the issue failing which you will lose our respect and we will consider you as a dramabaz and phenku. You should follow the law and treat everyone equally. There should not be any pity on goondas/ terrorists belonging to sangh parivar. The terrorists who thrashed the auto driver and damaged the auto and burnt the meat by pouring kerosene are not human beings and should be treated as anti nationals + terrorists. We hope you will discharge your duty as per the oath taken by you while accepting your post.
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