Our immune system does not shut down with age, says a new study published in PLOS Pathogens today. T cells can respond to virus infections in an older person with the same vigor as T cells from a young person.

Researchers examined individuals, younger than 40, between 41 to 59 years of age and older than 60, infected with three different viruses, including West Nile, and found the older group demonstrated perfectly normal immune responses.

Both the number of virus-fighting T cells and the functionality of the T cells were equivalent in all three groups.

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