Beta-haemolytic streptococci species are further separated into Lancefi eld groups (after Rebecca Lancefield, the American microbiologist who developed this classifi cation system in the 1930s)
Beta-haemolytic streptococci speciesare further separated into Lancefi eldgroups (after Rebecca Lancefield,the American microbiologist who developedthis classifi cation system inthe 1930s)