Which risk increases as a patient's regulatory T cell count declines following prolonged exposure to a novel viral antigen?

💡 Explanation

A decline in regulatory T cells impairs the immune system's ability to suppress self-reactive lymphocytes, because this failure of self-tolerance leads to an increased risk of autoimmune reactions. Therefore, autoimmunity is more likely, rather than diminished cytotoxic T lymphocyte activity, which would increase infection susceptibility.

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