Scientists discover flaw in flu vaccines

MINOR variants of flu strains carry a bigger viral punch than previously realised, according to international researchers including a team from the University of Sydney.

Their work, which examined samples from the 2009 flu pandemic in Hong Kong, shows that these minor strains are transmitted along with the major strains and can replicate and elude vaccines.

"A flu virus infection is not a homogeneous mix of viruses, but, rather, a mix of strains that gets transmitted as a swarm in the population," says Dr Elodie Ghedin, a professor at New York University's