WASHINGTON (Reuters) - The human body makes rare antibodies effective against all flu viruses and these might be boosted to design a better universal flu treatment, researchers reported on Monday.
Tests on mice suggest these immune system proteins could help most people survive a normally lethal dose of flu virus, the team at the University of Wisconsin and Seattle-based Theraclone Sciences said.
"The ability of these antibodies to protect mice from highly lethal strains of influenza is encouraging," said Yoshihiro Kawaoka, a flu expert at the University of Wisconsin-Madison and University of Tokyo who worked on the study, said in a statement.
"Such antibodies may be especially useful during outbreaks of newly emerging, highly pathogenic influenza viruses."
H1N1 swine flu is still spreading globally, having caused the first pandemic of the 21st century. While it is a relatively mild strain, it has killed far more children and young adults than flu usually kills and could easily mutate into a more virulent form.
Regular seasonal flu does its own share of damage, killing 250,000 to 500,000 people globally in an average year, according to the World Health Organisation.
And new strains could move into the human population any time -- including the highly lethal but still rare H5N1 bird flu, which has killed 295 of 499 people infected since 2003.
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