
Flu vaccines don't match the main circulating flu virus strain, researchers find
CNN
One of the main circulating influenza viruses has changed and the current flu vaccines don't match it well any more -- an indication they may not do much to prevent infection, researchers reported Thursday. But they are still likely to prevent severe illness.
"From our lab-based studies it looks like a major mismatch," Scott Hensley, a professor of microbiology at the University of Pennsylvania who led the study, told CNN.
It's bad news for the vaccine, he said. Influenza vaccines protect against four different strains of the flu: H3N2, H1N1 and two strains of influenza B. Hensley's study only covers H3N2, but that happens to be the main circulating strain.

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