Similar to the present study in which an increase of serum IFNγ was detected between days 7 and 10 post-infection in the infected/untreated group, a previous study reported an increase of serum IFNγ levels between days 5 and 8 post-infection following an infection with 50 oocysts of the T. gondii M4 isolate (63). Here, IFNG is linked to infection.