Pathogenesis, treatment, and prevention of pneumococcal pneumonia

Tom van der Poll1, Steven M Opal

  • 1Centre for Infection and Immunity Amsterdam, Centre for Experimental and Molecular Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, the Netherlands. t.vanderpoll@amc.uva.nl

Lancet (London, England)
|November 3, 2009
PubMed

Insights

Streptococcus pneumoniae causes pneumonia worldwide. Understanding how this bacterium evades host defenses reveals new strategies for vaccines and antibiotics to combat pneumococcal infections.

Area of Science:

  • Microbiology
  • Immunology
  • Infectious Diseases

Background:

  • Streptococcus pneumoniae is a leading cause of community-acquired pneumonia globally.
  • It commonly colonizes the upper airways of healthy individuals.
  • Colonization is a dynamic process involving pathogen proliferation and host invasion.

Purpose of the Study:

  • To explore molecular mechanisms of pneumococcal evasion of host defenses.
  • To identify potential therapeutic targets for controlling pneumococcal infections.

Main Methods:

  • Analysis of molecular mechanisms used by Streptococcus pneumoniae.
  • Investigation of host-pathogen interactions during colonization and invasion.

Main Results:

  • Pneumococci employ sophisticated strategies to evade host-sensing systems.
  • Understanding these evasion tactics offers insights into novel treatment approaches.

Conclusions:

  • A multifaceted approach is necessary to control Streptococcus pneumoniae.
  • This includes diverse vaccine antigens, antibiotic combinations, and immunoadjuvant therapies.

Related Concept Videos

Pneumonia V: Nursing management and Prevention01:30

Pneumonia V: Nursing management and Prevention

Nursing management of pneumonia involves promoting airway patency, facilitating rest and conserving energy, encouraging fluid intake, maintaining nutrition, and educating patients.
The nurse must practice strict medical asepsis and adhere to infection control guidelines to minimize healthcare-associated infections.
Enhance airway patency
Position the patient correctly to facilitate drainage of the affected lung segments. Manual or mechanical percussion and vibration can also be employed.
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:
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...
Pneumonia IV: Management01:28

Pneumonia IV: Management

The treatment of pneumonia varies based on its severity and the causative pathogen. Here is a structured approach to managing pneumonia, integrating pharmaceutical and supportive care strategies.
Bacterial Pneumonia Treatment
For bacterial pneumonia, antibiotics serve as the cornerstone of therapy. Initial treatment often begins with empirical antibiotics, tailored to the anticipated causative organism and adjusted based on culture results. Key antibiotic choices include:
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...