system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 65-year-old man comes to his primary care physician for a routine health maintenance examination. He takes no medications. Physical examination and laboratory studies show no abnormalities. Compared to a healthy adolescent, this patient is most likely to have which of the following changes in immune function?
assistant
Decreased responsiveness to vaccines