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Group A Streptococci are a species of gram-positive bacteria responsible for causing a number of pyogenic (pus-producing) infections including impetigo, scarlet fever and pneumonia. Further fatal complications arising from infection include the development of meningitis and sepsis. David Goulding, Wellcome Trust Sanger Institute. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.