However, Peng et al. showed that susceptibility or resistance to ETEC F4ab/ac infection in pigs was obviously correlated with the A → G mutation at site G243 in intron 17 of the MUC4 gene and, combined with prophylactic information, demonstrated that the GG type of the MUC4 gene was an antidiarrhea genotype [12]. The gene discussed is MUC4; the disease is infection.