Invasive Group A Streptococcal Disease (IGAS)

Severe IGAS is a rapidly progressive disease. Provide chemoprophylaxis to close contacts as soon as possible, preferably within 24 hours of case identification. However, it is still recommended up to 7 days after the last contact with a severe invasive case. Cases with lab confirmation of GAS from a non-sterile site, assess for invasiveness and signs of clinical severity. If found to be non-invasive and clinically stable, it is not reportable and no further action required.

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Communicable Disease Control Manual


Follow Up Required

Report to: Office of the Chief Medical Health Officer



Includes clinical or practice updates/changes regarding the disease for the past six months. These updates may not have been noted in the SOPs or guidelines. Any updates older than six months will be archived on this page.