Abstract
In nude mice which originally had no ability to respond to sheep red blood cells, an enhanced response to the same antigen with IgM-IgG switching was demonstrated during subacute infection with mouse hepatitis virus. IgM antibody-producing cells in the spleen were detected at days 2 to 6 after the antigen injection and IgG antibody-producing cells appeared at day 6 or later. The secondary IgG response, though not remarkable, was recognized after reinjection of the antigen 10 days after the first injection.
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