se·ro·type 
(sîrə-tīp′, sĕr-)
(sîrə-tīp′, sĕr-)n.
A group of closely related microorganisms distinguished by a characteristic set of antigens. Also called serovar.
tr.v. se·ro·typed, se·ro·typ·ing, se·ro·types
To classify according to serotype; assign to a particular serotype.