To gain insight into potential disruption of cardiac autonomic function in the C3H/HeN:JR host:parasite infection model, we assessed the expression of nine nervous system-related genes at 6 wpi (the late acute stage in this model) in addition to the inducible and endothelial nitric oxide synthases (Nos2/iNOS, Nos3/eNOS). Here, NOS3 is linked to parasitic infectious disease.