Max Delbrück Center for Molecular Medicine in the Helmholtz Association Jun 25 2026 Reviewed As we age, the immune system gradually declines and becomes less effective at responding to infections and vaccines. This process, known as immunosenescence, contributes to an increased risk of age-related health issues in older people and can weaken their response to vaccinations.  Researchers led by Dr. Katja Simon, Group Leader of the Cell Biology of Immunity lab at the Max Delbrück Center, and Dr.

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