Streptococcus equisimilis

Streptococcus equisimilis is a species of "Streptococcus", initially described by Frost in 1936. As a result of several DNA hybridization studies in 1983, the species was merged into "Streptococcus dysgalactiae". Subsequently, "S.dysgalactiae" was divided into the subspecies "Streptococcus dysgalactiae subspecies equisimilis" and "Streptococcus dysgalactiae subspecies dysgalactiae". Although the name "Streptococcus equisimilis" is no longer valid, it is still encountered both in clinical practice, and in scientific journals.