Even after 90 years, the immune system doesn’t forget the face of a mass-murderer. A new study shows that survivors of the 1918 Spanish flu pandemic still have immune cells that remember the culprit virus.
Such long-lived immunity was thought to be impossible without periodic exposure to the microbe that stimulated the immune system in the first place. But a study published in advance online August 17 and slated for an upcoming issue of Nature reveals that immunity to a virus can last nearly a century.
“This is a really extraordinary finding,” says Peter Palese,
a virologist at Mount Sinai School of Medicine in
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