IL6 and infection: The mRNA abundance of TNF-α, IL-1β and IL-6 were significantly up-regulated from 6 h to 24 h post infection (Fig 1A, 1D, and 1F), while those of iNOS, Arg-1 and IL-10 did not change significantly from 18 h to 24 h post infection (Fig 1B, 1C, and 1E).