serotype

n.
A group of closely related microorganisms distinguished by a characteristic set of antigens.

tr.v., -typed, -typ·ing, -types.
To classify according to serotype; assign to a particular serotype.

(sēr'ə-tīp', sĕr'-)
n.

See serovar.

v., -typed, -typ·ing, -types.

To classify according to serovar; assign to a particular serovar.

The type of a microorganism determined by its constituent antigens based on one of several different antibody–antigen reactions, or a taxonomic subdivision based thereon.