Rising invasive group A streptococcal (iGAS) infections

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To: Local Health Care Providers

Public Health Sudbury & Districts is receiving a higher than expected number of reports of invasive group A streptococcal (iGAS) infections in the Sudbury and Manitoulin districts. Between October and November 2025, seventeen (17) infections were reported, 4 of which were severe. This is 3 times more than in the same period last year.

Group A Streptococcus (GAS) is the common cause of bacterial infections including strep pharyngitis, impetigo, scarlet fever, and cellulitis. Although rare, GAS infections can become invasive and quickly progress, leading to serious conditions such as streptococcal toxic shock syndrome, sepsis, soft tissue necrosis, meningitis, pneumonia, and death.

Factors for higher risk of iGAS infection

• chronic illness (for example, diabetes)
• weakened immune systems
• open wounds
• respiratory illness in the past 2 weeks
• medications injected
• Injection drug use

Prevention

• Maintain higher suspicion for GAS infections when there are compatible symptoms (e.g. fever, sore throat, inflammation of or exudate on tonsils, impetigo, cellulitis, erysipelas or scarlet fever rash).
• Inform patients at higher risk for iGAS about symptoms and when to seek immediate medical care.
• Educate patients about the importance of cleaning and treating wounds.
• Encourage respiratory prevention measures, including completing all doses of antibiotics, if prescribed.

Additional information

Information about GAS and invasive infections is also available on Public Health’s website at www.phsd.ca. You can also contact the Control of Infectious Diseases program by calling 705.522.9200, ext. 772 (toll-free 1.866.522.9200).

Sincerely,

Original Signed By

Emily Groot, MD, MPH, FRCPC (she/her)
Associate Medical Officer of Health