Via the South China Morning Post: Swine flu: New strain of virus found in China can transit easily to humans, cause pandemic. Excerpt:
An overseas study shows an influenza virus strain commonly found among pigs in China has the potential to transmit efficiently to humans and urged governments to take immediate action to prevent an outbreak.
The study published on Monday by the Proceedings of the National Academy of Sciences of the United States of America said the swine flu virus, identified as the Eurasian avian-like H1N1 strain, were found in 139 of 36,417 pigs taken for tests from 10 provinces.
This strain has been circulating in pigs since 1979 and is different from the H1N1 strain that caused the 2009 flu epidemic, researchers said.
The 2009 epidemic broke out in 214 countries and killed at least 18,209 people. In Hong Kong, 282 patients had severe complications, of whom 80 died.
The researchers found that the Eurasian avian-flu like H1N1 strain was preferentially bound to human-type receptors, and nine of the 10 tested viruses could be transmitted in ferrets by respiratory droplets.
“After long-term evolution in pigs, the EAH1N1 SIVs have obtained the traits to cause a human influenza pandemic,” they said.
Researchers found that only 3.6 per cent of children aged below 10 and 13.4 per cent of the elderly aged 60 or above had antibodies against one of the two subgroups of the Eurasian avian-like H1N1 lineage. No adults have antibodies against this subgroup.
None of the children, adults or the elderly has antibodies against the second subgroup, they said.
Their study also found other subtypes of flu viruses, including the H1N1 and pH1N1 strains, in another 89 of the 36,417 pigs tested between 2010 and 2013.