Streptococcal toxic shock syndrome (STSS) is a rare but severe and rapidly progressing invasive bacterial infection. It is caused by *Streptococcus pyogenes* (Group A Streptococcus), which produces toxins that lead to widespread organ damage and shock. While it can affect anyone, it often occurs in individuals with existing skin wounds or underlying health conditions.
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Streptococcal toxic shock syndrome was first recognized as a distinct clinical entity in the late 1980s. Its emergence was linked to more virulent strains of *Streptococcus pyogenes* that produce specific toxins. The recognition of STSS highlighted the severe potential of Group A Strep infections, drawing parallels to staphylococcal toxic shock syndrome but with its own distinct epidemiology and features.
*Streptococcus pyogenes* bacteria, which cause STSS, are commonly found in the throat and on the skin. STSS typically occurs when these bacteria invade deeper tissues or the bloodstream, often through breaks in the skin like cuts, surgical wounds, or even chickenpox lesions. While the bacteria can spread person-to-person through respiratory droplets or direct contact, invasive disease like STSS is less about direct transmission of the syndrome itself and more about the bacteria finding an entry point into the body of a susceptible individual.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
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Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Trusted information from leading health organizations
Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-07-18
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