Level of interleukin-1 , interleukin-2 , interleukin-4 , interleukin-5 , interleukin-6 , interleukin-9 , interleukin-10 , interleukin-12 , interleukin-13 , tumor necrosis factor - , interferon - , C-reactive protein , and procalcitonin were measured .