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Related Concept Videos

Endocarditis I: Introduction01:25

Endocarditis I: Introduction

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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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Endocarditis IV: Nursing Management01:29

Endocarditis IV: Nursing Management

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Infective endocarditis (IE) is a chronic infection of the heart's endocardium, primarily affecting the heart valves. A detailed nursing assessment for a patient with IE involves collecting subjective and objective data to ensure an accurate diagnosis and timely intervention.Subjective DataThe nurse gathers information about the patient's symptoms and complaints during the subjective assessment. Patients with infective endocarditis often report non-specific symptoms that can mimic other...
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Myocarditis I: Introduction01:21

Myocarditis I: Introduction

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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Rheumatic Heart Disease I: Introduction01:23

Rheumatic Heart Disease I: Introduction

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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...
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Endocarditis II: Clinical Features of Infective Endocarditis01:25

Endocarditis II: Clinical Features of Infective Endocarditis

40
Endocarditis can present various clinical features depending on the causative organism and the patient's underlying health conditions. Initially, the clinical features of infective endocarditis develop gradually, presenting with nonspecific symptoms that can be easily mistaken for other illnesses.General SymptomsEarly symptoms of infective endocarditis are fever, chills, weakness, malaise, fatigue, and weight loss. These symptoms reflect the systemic nature of the infection and the body's...
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Pneumonia I: Introduction01:30

Pneumonia I: Introduction

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Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
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Related Experiment Video

Updated: Oct 4, 2025

Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
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Endocarditis Caused by Nontypeable Streptococcus pneumoniae.

Stefanie S V Henriet1, Jeroen D Langereis2, Stephanie W Lo3

  • 1Department of Pediatric Infectious Diseases and Immunology, Amalia Children's Hospital, Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, The Netherlands.

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
|February 8, 2022
PubMed
Summary
This summary is machine-generated.

Nontypeable Streptococcus pneumoniae, lacking a capsule, caused infective endocarditis in an infant. This case suggests bacterial adaptation, not host immunity, drove the infection, challenging the capsule's necessity.

Keywords:
Streptococcus pneumoniaebacterial polysaccharide capsuleinfective endocarditispathogenesis

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Area of Science:

  • Infectious Diseases
  • Bacteriology
  • Pediatric Cardiology

Background:

  • The Streptococcus pneumoniae capsule is traditionally considered essential for causing bacteremia.
  • Nontypeable Streptococcus pneumoniae strains lack a polysaccharide capsule, often limiting their pathogenic potential.

Purpose of the Study:

  • To report and analyze an unusual case of infective endocarditis caused by a nontypeable Streptococcus pneumoniae strain in an infant.
  • To investigate the factors contributing to infective endocarditis in the presence of a deficient bacterial capsule.

Main Methods:

  • Clinical case presentation of an infant with ventricular septal defect and infective endocarditis.
  • Microbiological investigation to identify the causative agent as nontypeable Streptococcus pneumoniae.
  • In-depth analysis to determine the pathogenic mechanisms and contributing factors.

Main Results:

  • Infective endocarditis was confirmed in an infant with a ventricular septal defect.
  • The causative agent was identified as a nontypeable Streptococcus pneumoniae strain, which possessed a deficient capsule.
  • Investigation indicated that bacterial adaptation and fitness for endocarditis were favored over host immune deficiency.

Conclusions:

  • This case challenges the established view of the Streptococcus pneumoniae capsule's indispensability in bacteremia and endocarditis.
  • Nontypeable Streptococcus pneumoniae can cause severe infections like infective endocarditis, highlighting bacterial adaptability.
  • The findings suggest that bacterial factors, rather than solely host immune status, play a critical role in the pathogenesis of infective endocarditis in specific contexts.