Blood-based biomarker may predict whether you’ll get the flu

“We found that a type of immune cell called a natural killer cell was consistently low at baseline in individuals who got infected,” says Bongen. “Those who had a higher proportion of natural killer cells had better immune defenses and fought off illness. So we asked, ‘What are the genes that represent natural killer cells?’ And there turned out to be this one gene, KLRD1, that seemed to be a good target.”

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