Invasive group A streptococcal disease – (iGAS)

Statutory notification

Public health management

Important information

  • Infectious agent: Streptococcus pyogenes also known as Group A Streptococcus (GAS) bacteria.
  • Transmission: GAS is spread from one person to another via respiratory droplets from sneezing, coughing or kissing. It can also spread by direct contact with people with GAS on their skin.
  • Incubation period: Not well defined. Usually 1 to 3 days, but sometimes up to 30 days.
  • Infectious period: Cases are infectious from 7 days before symptom onset until symptoms have resolved or after 24 hours of effective antibiotic therapy has been initiated.
  • Case exclusion: Isolate until at least 24 hours have elapsed after receiving appropriate antibiotic therapy.
  • Contact exclusion: Do not exclude.
  • Treatment: Antibiotic treatment is available.
  • Immunisation: None available.
  • Case follow-up: Where appropriate, the relevant public health unit will manage the public health response.


Fact sheets

Notifiable disease data and reports

Last reviewed: 23-01-2023
Produced by

Public Health