1. A group of bacteria containing a common antigen, used in the classification of certain genera of bacteria. 2. A group of viral species that are antigenically closely related.
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se·ro·group 'sir-ō-.grüp n a group of serotypes having one or more antigens in common
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se·ro·group (sērґo-gr
p) [sero- + group] 1. a group of bacteria containing a common antigen, possibly including more than one serovar (q.v.), species, or genus. A serogroup is a tentative and unofficial designation, used in the classification of certain genera of bacteria, e.g., Leptospira, Salmonella, Shigella, and Streptococcus. 2. a group of viral species that are closely related antigenically.
Medical dictionary. 2011.