TH and Nematoda infectious disease: The acute stage of a primary infection with E.maxima is predominated by Th-1 type immune responses (Cornelissen et al., 2009; Hong et al., 2006) which may be more preserved under different growth rates than Th-2 type immune responses evoked by nematode infections, where resistance has been shown to be sensitive to selection for growth rate (Coltherd et al., 2009; Zaralis et al., 2008).