The H1N1 swine flu virus may be starting to mutate, and a slightly new form has begun to predominate in Australia, New Zealand and Singapore, researchers reported on Thursday.
More study is needed to tell whether the new strain is more likely to kill patients and whether the current vaccine can protect against it completely, said Ian Barr of the World Health Organisation Collaborating Centre for Reference and Research on Influenza in Melbourne, Australia and colleagues.
"However, it may represent the start of more dramatic antigenic drift of the pandemic influenza A(H1N1) viruses that may require a vaccine update sooner than might have been expected," they wrote in the online publication Eurosurveillance.
It is possible it is both more deadly and also able to infect people who have been vaccinated, they said.
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