Infection of BALB/c and STS mice resulted in 10-500× increase of production of IFNγ (Figure 9A) IL-2 (Figure 9B), IL-4 (Figure 9C), IL-6 (Figure 9D) and IL-10 (Figure 9E) by their splenocytes, whereas strain O20 splenocytes did not produce any of these cytokines except IL-6 (Figure 9D). Here, IL4 is linked to infection.