Streptococcal superantigens and the return of scarlet fever
Jacklyn R Hurst1, Stephan Brouwer2, Mark J Walker2
1Department of Microbiology and Immunology, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada.
Insights
Scarlet fever, caused by Streptococcus pyogenes superantigens, is reemerging globally. These toxins may offer bacterial advantages and present potential vaccination targets.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Streptococcus pyogenes (group A Streptococcus) is a significant human pathogen.
- Scarlet fever, a toxin-mediated disease, presents with a characteristic rash, primarily in children.
- Outbreaks of scarlet fever have resurged globally in recent years.
Purpose of the Study:
- To review recent findings on the role of superantigens in S. pyogenes infections.
- To explore how superantigens provide a fitness advantage to the bacteria.
- To discuss the potential of superantigens as targets for vaccination strategies.
Main Methods:
- Literature review of recent scientific findings.
- Analysis of the role of bacterial superantigens in host-pathogen interactions.
- Discussion of immunological mechanisms and vaccine development.
Main Results:
- Superantigens are potent bacterial toxins that modulate the immune system.
- These toxins are implicated in the pathogenesis of scarlet fever.
- Recent data suggest superantigens enhance S. pyogenes fitness in human hosts.
Conclusions:
- Superantigens play a crucial role in S. pyogenes infections like scarlet fever.
- Understanding superantigen function is key to addressing the resurgence of these diseases.
- Superantigens represent promising targets for novel vaccine development against S. pyogenes.
Abstract:
Streptococcus pyogenes (group A Streptococcus) is a globally disseminated and human-adapted bacterial pathogen that causes a wide range of infections, including scarlet fever. Scarlet fever is a toxin-mediated disease characterized by the formation of an erythematous, sandpaper-like rash that typically occurs in children aged 5 to 15. This infectious disease is caused by toxins called superantigens, a family of highly potent immunomodulators. Although scarlet fever had largely declined in both prevalence and severity since the late 19th century, outbreaks have now reemerged in multiple geographical regions over the past decade. Here, we review recent findings that address the role of superantigens in promoting a fitness advantage for S. pyogenes within human populations and discuss how superantigens may be suitable targets for vaccination strategies.
More Related Videos
Related Concept Videos
01:30Tonsillitis I: Introduction
Etiology
Three primary contributing factors have been identified.
01:26Antigens Involved in Adaptive Immunity
Complete Antigens
Complete antigens possess both immunogenicity and...
00:42Cross-reactivity
01:23Rheumatic Heart Disease I: Introduction
01:30Acute Pharyngitis
Acute pharyngitis is the inflammation of the back of the throat (pharynx), commonly resulting in a sore throat. It is a frequently encountered condition that prompts individuals to seek medical advice.
Classification
Acute pharyngitis can be categorized based on its underlying cause:
01:31Defense Against Bacterial Pathogens
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...