| serotype | <immunology> The genotype of a unicellular organism as defined by antisera against antigenic determinants expressed on the surface. (28 May 1998) |
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| heterologous serotype | An antibody that was induced by one antigen and reacts with another antigen. (05 Mar 2000) |
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| homologous serotype | An antibody that was induced by a particular antigen and reacts with that antigen. (05 Mar 2000) |