IPA: /ˈsɪərəˌvɑːr/
KK: /ˈsɪərəˌvɑr/
A group of microorganisms that have a specific set of antigens, which are used to identify them.
The laboratory identified the bacteria by its serovar.
Serovar is formed from "sero-" (from Latin "serum", meaning serum or fluid) and "var" (from Latin "varius", meaning varied or different). The term refers to a distinct variation within a species of microorganisms, particularly in the context of serological classification.
Think of 'serum' ('sero-') as a fluid that helps identify 'varied' ('var') types of microorganisms, which is what a serovar represents.
No commonly confused words.