In general, women have stronger immune response, including( to the) flu vaccine, the evidence is that these differences reflect hormonal, genetic and environmental differences, which can change over the lifespan, so these differences may be less prominent among older adults.

Phyllis Zee

Phyllis C. Zee is the Benjamin and Virginia T. Boshes Professor in Neurology, the director of the Center for Circadian and Sleep Medicine (CCSM) and the chief of the Division of Sleep Medicine (neurology) at the Feinberg School of Medicine, Northwestern University, Chicago. She is also the medical director of Sleep Disorders Center at Northwestern Memorial Hospital.

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