Kory has abnormally high levels of cytotoxic T-cells circulating in his blood. What is the most likely cause of this condition?

Cytotoxic T-cells help destroy cells infected by viruses, so a viral infection can stimulate their production and increase their levels in the blood. Inflamed skin and high blood pressure do not specifically cause this increase, and filtering lymph is a normal function of lymph nodes. The most likely cause is a viral infection.

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