noun
serotype; serovar
Technical term in microbiology and immunology for a distinct variation within a species of bacteria or virus, classified by surface antigens.
このワクチンは複数の血清型に対応している。
This vaccine covers multiple serotypes.
サルモネラ菌には多
There are many serovars of Salmonella.
型 is a general suffix for 'type' or 'model'; 血清型 specifically refers to serological typing.
Compound of 血清 (blood serum) and 型 (type, model), likely a calque from English 'serotype' or German 'Serotyp'.