minty3 writes "Scientists say they used the pandemic as a 'natural experiment' to discover how the body's immune system builds resistance to the flu. The research, published in the journal Nature Medicine, showed how certain immune cells helped some avoid the severe illness. 'Our findings suggest that by making the body produce more of this specific type of CD8 T cell, you can protect people against symptomatic illness,' said study leader Professor Ajit Lalvani, from the National Heart and Lung Institute at Imperial College London, in a statement. 'This provides the blueprint for developing a universal flu vaccine.'"
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