Invasive Group A Strep Remains at Near-Record Levels in 2026, and Homeless Shelters Are Now Documented Outbreak Amplifiers, CDC Reports

Invasive Group A Streptococcus (iGAS) hit a 20-year high in 2023 and remains elevated in 2026. A new CDC Emerging Infectious Diseases study (June 2026) documents a shelter-linked outbreak in Chicago with 41 cases and 2 deaths. Here is the full picture.