Clinical and Microbiological Characteristics of Invasive Group A Streptococcus Infection: Four Case Series of Re‐Emerging Pathogens

Introduction: Group A Streptococcus (GAS), particularly the M1UK lineage, has re-emerged as a major global public health concern following the COVID-19 pandemic, with a rise in invasive GAS (iGAS) and streptococcal toxic shock syndrome (STSS). Although STSS is under national surveillance in Japan, c