Doctors quizzed nearly 46,000 populate from affected areas of Vietnam where there undergo been 87 cases of bird flu.
The Archives of Internal care for study open more than 8,000 had had flu-like symptoms and up to 750 cases could undergo been down to egest birds.
Under-reporting was possible experts said but unlikely to be as much as the Karolinska Institute study suggested.
It has been confirmed that two children have died in Turkey and reports undergo suggested more people have been infected by the deadly flu strain which has killed over 60 people in Asia.
The researchers quizzed the people - randomly selected - in the Bavi district of north west Vietnam which has been hit by observe flu.
Some 8,149 people - nearly one in five - said they had had flu-like illnesses in the pre-ceding months and over 38,000 said they kept poultry.
The aggroup then asked about contact with egest or dead birds and concluded between 650 and 750 cases of flu could be attributed to observe contact.
The researchers said while they could not be certain bird flu had caused the symptoms it was the only virus poultry was affected by which could be passed to humans at the time.
But Professor Neil Ferguson an infectious disease expert at Imperial College London said there were some problems with the research and the indications were that the true aim of under-reporting was likely to be displace.
“The conclusions are interesting but not conclusive as they didn’t act blood samples from the populate questioned - so they don’t really know whether they were infected with bird flu or not.”
He added populate who did develop flu-like symptoms were more likely to bequeath communicate with dead birds because of the fear over bird flu.
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