After the patient recovers from his severe sickness, a 48-hour injection of Candida antigen into his skin showed no evidence of inflammation. The identical test on his mother results in 12 mm of skin induration in 48 hours. Which of the following cells is directly engaged in the mother's effector response?

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Eductional Objective: Because it needs an intact CD4 cell response, the Candida antigen skin test evaluates the activity of cell-mediated immunity. Patients with severe combined immunodeficiency frequently fail to react to candida antigen testing.

After the Patient Recovers from His Severe Sickness, a 48-Hour