Survivors of 1918 Flu Pandemic Immune 90 Years Later

People who lived through the 1918 flu pandemic that killed 50 million worldwide are still producing antibodies to the virus 90 years later, researchers report.

"Most people have a notion that elderly people have very weak immunity or they have lost immunity," said lead researcher Dr. James E. Crowe Jr., a professor of pediatrics, microbiology and immunology at Vanderbilt University.