Investigation Resources > All Pathogens & Diseases > Group A Streptococcus

Group A Streptococcus

Also referred to as group A strep or GAS

Published
November 24, 2024
Last updated
July 25, 2024

About GAS

Bacteria called group A Streptococcus can cause many different infections. Invasive group A strep (iGAS) infections include necrotizing fasciitis and streptococcal toxic shock syndrome. The most common iGAS outbreaks investigated in the United States are those occurring in long-term care (LTC) facilities. Healthcare-associated iGAS clusters can also involve postpartum and post-surgical infections. 

GAS is spread by respiratory droplets, direct contact with mucus or secretions of an infected person, or by contact with infected or colonized wounds. 

Outbreaks and clusters of healthcare-associated iGAS often require urgent public health action. Even a single case of iGAS usually warrants investigation and follow-up, to rule out a larger problem.

CDC is available to assist state, tribal, local, and territorial health departments for GAS outbreaks, particularly for persistent, large, or severe outbreaks. For assistance, contact [email protected].

Resources, Guides, Reports, & Toolkits

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Featured New Updated

Decision Tool for Investigating GAS Infections in Long-Term Care Facilities

 By CDC

This toolkit outlines detailed actions that investigators should consider, depending on the number of cases of GAS identified.

New Updated

Additional GAS Investigation Resources

 By CDC

Compilation of links to helpful resources from state health departments including sample line lists and facility letters; CDC's interfacility infection control transfer form is also included.

New Updated

Prevention of iGAS among household contacts of case patients and among postpartum and postsurgical patients; recommendations from the Centers for Disease Control and Prevention

 By Prevention of iGAS Infections Workshop Participants

Recommendations for controlling iGAS among exposed household contacts and for responding to postpartum and postsurgical iGAS.

New Updated

A Cluster of Group A Streptococcal Infections in a Skilled Nursing Facility—the Potential Role of Healthcare Worker Presenteeism

 By Journal

Outbreak report that examined the role of working while ill, or “presenteeism,” in the introduction and transmission of GAS within a skilled nursing facility.

New Updated

ICAR Observation Form - Wound Care

 By CDC

Audit tool to help identify infection control issues during wound care, a common source of GAS transmission in LTC outbreaks.

Principles & Practices

Comprehensive information to build, standardize or improve practices related to HAI/AR outbreak detection, reporting, investigation, or control.

Group A Streptococcus Outbreak Reports & News