Immune responses of mice that received low regimen of immunization with TMV-5B19L by intranasal injection. IgG and IgA antibodies specific to peptide (A, B, E, F, I, and J ) or TMV (C, D, G, H, K, and L) were determined in mouse sera by using as antigen 5B19 peptide-BSA conjugate or with TMV, respectively, in ELISAs as in Fig. 5. The regime of immunization of each group is shown in Fig. 4. The small vertical bars on the x axis indicate the days of immunization. Each line represent the response of an individual mouse.