group c streptococcus specieshemolytic streptococcus group cbeta streptococcus group cgroup c and g streptococcusbeta haemolytic streptococcus group cbeta hemolytic streptococcus group clancefield group cstreptococcus c infectionstreptococcus type cgroup c strepgroup c streptococcal infectiongroup c strep treatment guidelines