HLA-C and Increased total eosinophil count: The basis of this susceptibility to eosinophilia is dependent on genetic background, rather than the MHC haplotypes expressed in these strains, as Balb/b mice, which express the same MHC haplotypes as C57Bl/6 mice in the context of the Balb/c genetic background, were as susceptible to eosinophilia as the Balb/c strain [22].