Interleukin-1 and IL-6 were detected in the serum. This indicates:

Interleukin-1 and IL-6 were detected in the serum. This indicates:



a. mucosal IgA has been degraded
b. B lymphocyte activation
c. a macrophage has encountered an antigen
d. cancer cells are forming
e. natural killer cells have autolyzed


Answer: c. a macrophage has encountered an antigen


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