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Related Concept Videos

Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

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...
Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
Pneumonia III: Complications and Assessment01:30

Pneumonia III: Complications and Assessment

Pneumonia poses the potential for numerous complications that warrant consideration. These complications include the following:
Atypical Pneumonia01:14

Atypical Pneumonia

Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...

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Related Experiment Video

Updated: Jul 13, 2026

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
11:32

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Published on: February 23, 2014

Streptococcus pneumoniae bacteraemia in children.

C Myers1, Alain Gervaix

  • 1Department of Pediatrics, University Hospitals of Geneva, Switzerland.

International Journal of Antimicrobial Agents
|August 21, 2007
PubMed
Summary

Occult bacteremia from Streptococcus pneumoniae is common in young children, presenting diagnostic challenges due to fever as the sole symptom. Early diagnosis and appropriate antibiotic use are crucial for reducing severe outcomes and mortality.

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Related Experiment Videos

Last Updated: Jul 13, 2026

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
11:32

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Published on: February 23, 2014

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

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43
06:06

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

Published on: September 11, 2020

Area of Science:

  • Pediatrics
  • Infectious Diseases
  • Microbiology

Background:

  • Occult bacteremia caused by Streptococcus pneumoniae is the most common invasive bacterial infection in children under three years old.
  • Distinguishing occult bacteremia from viral illnesses is challenging for pediatricians due to overlapping symptoms, primarily fever.
  • Despite advanced medical care, the case fatality rate for bacteremia in infants under one year remains significant.

Purpose of the Study:

  • To review the challenges in diagnosing and managing occult bacteremia in young children.
  • To highlight the importance of laboratory markers in guiding antibiotic treatment decisions.
  • To discuss the impact of Streptococcus pneumoniae conjugate vaccines on invasive disease and the emergence of non-vaccine serotypes.

Main Methods:

  • Review of clinical presentation and diagnostic criteria for occult bacteremia.
  • Analysis of laboratory markers including white blood cell count, C-reactive protein, and procalcitonin levels.
  • Evaluation of management protocols and the role of antibiotic therapy.
  • Assessment of the epidemiological impact of Streptococcus pneumoniae vaccination.

Main Results:

  • Fever is often the only presenting symptom, complicating differential diagnosis with viral infections.
  • Laboratory tests are essential for accurate diagnosis and determining the need for antibiotic treatment.
  • The 7-valent conjugate vaccine has reduced invasive pneumococcal disease, but serotype replacement is a concern.
  • Case fatality rates for bacteremia in infants under one year are approximately 9% even in developed countries.

Conclusions:

  • Accurate diagnosis and timely antibiotic intervention are critical for managing occult pneumococcal bacteremia in children.
  • Vaccination strategies are effective in reducing disease burden but require ongoing surveillance for serotype shifts.
  • Continued monitoring of vaccine effectiveness and emerging serotypes is necessary to combat invasive pneumococcal disease.