抗原剂量对免疫应答的影响 virus antiviral pfu cytotoxicity TH1 response(FNY) TH2 response(IL-4 03+++ 1000 80604020020406080 Fig. 11. 1 Newborn mice were infected with either 0. 3 or 1000 plaque-forming units (pfu) of virus and the ctl response against virally infected targets was assessed together with the production of IFNY (TH1 cytokine)or IL-4(TH2 cytokine) in response to viral challenge. Mice infected with a low dose of virus make a TH1-type response and are protected. The results are presented as arbitrary units抗原剂量对免疫应答的影响