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Related Concept Videos

Rheumatic Heart Disease I: Introduction01:23

Rheumatic Heart Disease I: Introduction

Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
Streptococcal Pharyngitis01:27

Streptococcal Pharyngitis

Streptococcal pharyngitis, commonly known as “strep throat,” is an acute infection of the oropharyngeal tissues caused by the Gram‑positive Group A Streptococcus (Streptococcus pyogenes). Transmission occurs primarily through respiratory droplets expelled during coughing, sneezing, or talking.Mechanisms of Host Entry and Immune EvasionUpon entering the host, S. pyogenes adheres to the mucosal epithelial cells of the pharynx via surface proteins, notably lipoteichoic acid and the antiphagocytic...
Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies01:22

Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies

The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
Determinants of Bacterial Pathogenicity and Virulence01:20

Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
Rheumatic Heart Disease III: Medical Management01:21

Rheumatic Heart Disease III: Medical Management

Rheumatic heart disease (RHD) management can be divided into two main strategies: prevention and long-term management.Primary PreventionPrimary prevention focuses on timely diagnosis and management of group A streptococcal pharyngitis to prevent acute rheumatic fever. The most widely used antibiotic for treating this condition is intramuscular benzathine penicillin G.Acute Rheumatic Fever TreatmentThe primary treatment goal for a patient diagnosed with acute rheumatic fever is to suppress the...
Endocarditis I: Introduction01:25

Endocarditis I: Introduction

Introduction:Endocarditis is the infection of the endocardium, the inner lining of the heart and its valves. When the heart muscle is involved, the condition is termed myocarditis, while an infection of the outer lining is called pericarditis. Infective endocarditis (IE) primarily affects the endocardium, where pathogens adhere to the valves or lining, forming vegetation that can lead to severe complications. Infective endocarditis occurs when microorganisms, usually bacteria from other body...

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Related Experiment Video

Updated: Jun 23, 2026

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
09:25

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells

Published on: August 19, 2016

Streptococcus Pyogenes and Acute Rheumatic Fever: How Strong are the Links in the Chain?

Scott H Wirth1,2, Andrea Z Beaton3,4, Andrew Steer5

  • 1Heart Center, Primary Children's Hospital, Salt Lake City, Utah, USA.

Global Heart
|June 22, 2026
PubMed
Summary
This summary is machine-generated.

Streptococcus pyogenes infection strongly causes acute rheumatic fever (ARF) and rheumatic heart disease (RHD). Antibiotic treatment reduces ARF incidence, but more research is needed on skin infections and high-risk groups.

Keywords:
Rheumatic Heart Diseasehistorical reviewnarrative reviewprimary preventionstreptococcal pyogenesvaccine licensure

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Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
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Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling

Published on: April 7, 2015

Related Experiment Videos

Last Updated: Jun 23, 2026

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
09:25

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells

Published on: August 19, 2016

Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
08:25

Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling

Published on: April 7, 2015

Area of Science:

  • Infectious Diseases
  • Cardiology
  • Rheumatology

Background:

  • Acute rheumatic fever (ARF) and rheumatic heart disease (RHD) are serious sequelae of Streptococcus pyogenes infection.
  • Understanding the causal link is crucial for prevention and treatment strategies.

Purpose of the Study:

  • To review and critically evaluate the evidence linking Streptococcus pyogenes to ARF and RHD over nearly two centuries.
  • To assess the strength of evidence using established criteria for causality and evidence levels.

Main Methods:

  • Narrative review of historical and contemporary data.
  • Application of Bradford Hill criteria for causality.
  • Assessment using Oxford Centre for Evidence-Based Medicine levels of evidence.

Main Results:

  • Strong evidence confirms untreated S. pyogenes infection increases ARF incidence.
  • Antibiotic treatment significantly reduces ARF incidence across diverse settings.
  • Moderate evidence supports the causal link and S. pyogenes exclusivity as the precursor.

Conclusions:

  • The causal relationship between S. pyogenes and ARF is robustly supported by extensive evidence.
  • Gaps remain in understanding the role of skin infections and in contemporary data from high-risk populations.
  • Further research is essential, especially with the development of S. pyogenes vaccines and ARF-specific policies.