What do the different subclasses or groups of the coxsackie virus mean? I was positive for 2, 3, and 6.

Family names. The classification of viruses relies on a variety of shared vs different features which could relate to where they attack or how they differ in their structure. The coxsackie viruses were originally named for the place where they were found (coxsackie, new york) , but they are also enteroviruses (intestine attackers). Sub classes a ; b with subtypes are bases on their cell wall structure.