[Ditter]

What do they mean by “survivors of the 1918 flu had extra immune protection”?

[r9etb]

What do they mean by “survivors of the 1918 flu had extra immune protection”?

They're immortal, which is why the scientists can still use them for research....

[OldDeckHand]

"What do they mean by “survivors of the 1918 flu had extra immune protection”? "

They mean people who were alive in 1918, and were exposed to the Spanish Flu and have survived until today seem to have added immunity protection against H1N1 that people who weren't exposed to Spanish Flu don't.

[Cathy]

Those that has the flu in 1918 and survived still carried antibodies 70-80 years later, is how I read it.