IEC (IPEC-J2) monolayers express IFN-β but not IFN-α mRNA in response to C parvum infection. qRT-PCR analysis of (A) IFN-α (all) isotypes, (B) IFN-α7/11 isotypes, (C) IFN-α9 isotype, and (D) IFN-β during a 48-hour time course of C parvum infection in IPEC-J2 cells. N = 4 monolayers per treatment group and time point. For each monolayer, the Ct for target gene expression was normalized to expression of the housekeeping gene cyclophilin (ΔCt). Fold-change differences between uninfected and infected monolayers are expressed as compared with a representative uninfected monolayer at the same time point using the 2-ΔΔCt method. Bars represent means ± SD. *P < .05, **P < .01, Student t test comparison between uninfected and infected monolayers at same time point. Results were obtained from 1 independent experiment.