The IgG subclass responses to cold-adapted (ca) influenza A/Queensland/6/72 virus and purified haemagglutinin H3 was assessed in C57BL/6 and BALB/c mice. In BALB/c mice IgG2a was present as the major subclass in serum, lung and salivary secretions after two doses of ca virus. In contrast, the serum response in C57BL/6 mice was predominantly IgG1 after primary and secondary inoculations of ca virus. However, in lung and salivary secretions no specific subclass was dominant. When purified H3 was used as the inoculum, serum responses were dominated by IgG1 in BALB/c mice after two inoculations whereas all four subclasses were present at equal levels in C57BL/6 mice. Overall the lung and salivary responses detected in C57BL/6 mice were lower than those observed in BALB/c mice with all four subclasses contributing equally to the response in BALB/c mice. The neutralizing and haemagglutination inhibition abilities of the four Protein A-Sepharose-purified IgG subclasses differed between the BALB/c, C57BL/6 and CBA/CaH mice strains. IgG1 and IgG2a were most effective in BALB/c mice and in C57BL/6 and CBA/CaH mice, IgG2a and IgG2b. These results are discussed in terms of the differing abilities of replicating and non-replicating virus to stimulate differential responses in mice and the T1 and T2 helper cell concept.


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