GC and infection: We report evaluations of two additional commercially available mouse strains, C57BL/6NTac.Cg-Rag2tm1Fwa Il2rgtm1Wjl (RAG2-/-γc-/-), and C.B-Igh-1b/IcrTac-Prkdcscid (C.B-17 SCID) with or without additional steroid treatment, for susceptibility toD. immitis tissue-phase larval infection.