While treating group A streptococcal pharyngitis with antibiotics may reduce the severity and duration of illness, the primary benefit is in the significant reduction of risk of complications, most notably rheumatic fever. While groups C and G streptococci are occasionally recognized as causes of acute pharyngitis, the group B streptococcus isn’t a usual cause. And none of these other groups have been associated with development of rheumatic fever. So routine treatment of uncomplicated cases of non-group A streptococcal pharyngitis is not recommended.