Scientists at the Imperial College London have some promising news in the wake of the impending flu season. They are getting close to developing a universal flu vaccine. By studying blood samples taken during the 2009 swine flu pandemic, they found that those who avoided serious illness had more CD8 T cells in their blood at the start of the pandemic. Since T cells target the core of the virus, which doesn’t change even with new mutations, they are more effective at staving off the flu than antibodies. The team says this “provides a blueprint for developing a universal flu vaccine” that would protect us from new strains we haven’t yet encountered.