Some Older People May Be Immune to Swine Flu

On the other hand, up to 9 percent of adults ages 18 to 64 and 33 percent of those older than 60 had evidence of protection against the new virus before receiving a seasonal flu shot.

Schuchat said the findings should be "taken with caution" because of the relatively small number of blood samples and the use of an unconventional test of immune response to flu.

The tests also confirmed that seasonal flu vaccine is likely to have "little or no immune benefit" in protecting against the new virus, as many researchers had suspected.

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