NOS2 and infection: Consistent with Boczon’ et al. (2004), Kołodziej-Sobocińska et al. (2007), and Issa et al. (2008), iNOS expression in the presentstudy lasted until the end of the study (60th dpi), which may indicate the protectiverole of iNOS against early infection (intestinal phase) and encysting larvae (Issa et al. 2008).