S1E1R1O1V4A1R1
10 points
SEROVAR is validvalid
a group of microorganisms having a characteristic set of antigens [n SEROVARS]
a group of microorganisms having a characteristic set of antigens [n -S]
a group of microorganisms having a characteristic set of antigens [n SEROVARS]
a group of microorganisms having a characteristic set of antigens [n -S]