Pediatric Research Questions Related

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Immunity to a disease after recovery is possible because the first exposure to the pathogen has stimulated the formation of which of the following?

  • A. Antigens
  • B. Complement
  • C. Memory cells
  • D. Natural killer cells
Correct Answer: C

Rationale: Immunity to a disease after recovery is possible because the first exposure to the pathogen has stimulated the formation of memory cells. Memory cells are a type of immune cell that "remembers" the specific pathogen encountered during the initial infection. When the same pathogen tries to infect the individual again, these memory cells quickly recognize the pathogen and mount a faster and stronger immune response, leading to a quicker recovery and preventing the person from getting sick again from the same pathogen. This immune memory is the basis of acquired immunity, providing long-lasting protection against future infections by the same pathogen.