LONDON - A genetic variant commonly found in Chinese people may help explain why some got seriously ill with swine flu, a discovery scientists say could help pinpoint why flu viruses hit some populations particularly hard and change how they are treated.

Less than one per cent of Caucasians are thought to have the gene alteration, which has previously been linked to severe influenza. Yet about 25 per cent of Chinese people have the gene variant, which is also common in Japanese and Korean people.

British and Chinese researchers analyzed 83 patients admitted to a Beijing hospital during the 2009-2010 swine flu pandemic. Of those with serious complications like pneumonia, respiratory or kidney failure, 69 per cent had the genetic alteration. Among patients with mild illness, only 25 per cent did.

"It doesn't mean you should panic if you have this gene variant," said Andrew McMichael, director of the Weatherall Institute of Molecular Medicine at Oxford University, one of the study's authors. "Most people who have it won't run into any trouble at all."

He suggested people with this genetic predisposition to severe flu should be treated earlier and more aggressively than others.

McMichael estimated that people with the genetic variant were five to six times more likely to get severely ill once they're infected. The gene alteration doesn't make people more likely to catch the flu, since that depends on other factors like environmental exposure and previous immunity.

McMichael said the gene variant might give people the same susceptibility to get severely ill from other ailments including dengue, SARS and other flus. But it could also provide them with better immunity if they recover.

The research was published online Tuesday in the journal Nature Communications.

Some experts said it was an intriguing finding that shows a patient's response to a virus may determine how sick they will become.

"The bug in someone who gets severely ill is not any different than the one that infects someone who has mild illness," said Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota, who did not participate in the study. "It's the host that does all the damage to themselves."

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Genetics may explain why some Chinese got severe swine flu, could change flu treatments

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