Some wonderful news that we should remember during flu season. An article recently published in the NY Times describes a study reporting that despite the prevailing misconception to the contrary, older people (over 65 no longer qualifies as elderly I'm happy to see) appear to have some immunological memory of previous flu exposures. At least that is the theory offered to explain the observation noted concerning the 2009-10 flu season. While younger people had a higher than usual death rate during the flu season, people over 65 had a lower than normal death rate.
From my education about the immune system, I have always believed that a little illness (like a little exposure to germs) enhances overall wellness. Perhaps that is at work in this case as well.