fromNature
16 hours agoA universal flu vaccine has proved challenging - could it finally be possible?
On the basis of surveillance data on which strains were circulating, the WHO selected four that would become the foundation of that year's vaccine. One was an H3N2 virus strain that was the most prevalent of that particular subtype, at that moment. But by the time the vaccine was making its way into people's arms that autumn, a different version of the virus had taken over - and the vaccine was only 6% effective at protecting against it.
Science