1) Blood bank concern 2) Transfusion topic 
Serotype or serovar are distinct variations within a species of bacteria or viruses or among immune cells of different individuals. These microorganisms, viruses, or cells are classified together based on their cell surface antigens, allowing the epidemiologic classification of organisms to the sub-species level. A group of serovars with common an...
A subdivision of virus strains distinguished by protein or a protein component that determines its antigenic specificity. 
<immunology> The genotype of a unicellular organism as defined by antisera against antigenic determinants expressed on the surface. ... (28 May 1998) ... 
(sēr´o-tīp″) the type of a microorganism determined by its constituent antigens, or a taxonomic subdivision based thereon. serovar.
A subgroup of a particular species unique because of the anti-genic properties of some cellular component; a given species may contain many different subgroups of different serotype.The genotype of a unicellular organism as defined by antisera against antigenic determinants expressed on the surface.
Type: Term Pronunciation: sē′rō-tīp Synonyms: serovar
Serotype: The kind of microorganism as characterized by serologic typing (testing for recognizable antigens on the surface of the microorganism).
Variant of an infectious agent based on immunological testing.
serotype 1. A group of organisms, microorganisms, or cells distinguished by their shared specific antigens as determined by serologic testing. 2. The set of antigens that characterizes the group.
strain or variation of the same species of bacteria; also called serovar
Strains of a virus.