Related Experiment Video

Updated: Aug 18, 2026

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
09:12

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

Published on: January 17, 2014

A retrospective analysis of invasive Streptococcus pneumoniae infections in Trinidad

K P Williams1, M A Monteil

  • 1Department of Para Clinical Sciences, University of the West Indies, Trinidad and Tobago.

The West Indian Medical Journal
|April 29, 2000
PubMed

Insights

Invasive pneumococcal disease, often caused by Streptococcus pneumoniae, disproportionately affects young children and the elderly. This study found higher mortality in older adults, with all isolates remaining sensitive to penicillin and amoxycillin.

Area of Science:

  • Infectious Diseases
  • Bacteriology
  • Clinical Microbiology

Background:

  • Invasive pneumococcal disease (IPD) caused by Streptococcus pneumoniae remains a significant global health concern.
  • Understanding the epidemiology and clinical characteristics of IPD is crucial for effective prevention and treatment strategies.

Purpose of the Study:

  • To analyze the clinical presentations, predisposing factors, and outcomes of culture-positive IPD cases.
  • To assess the antibiotic susceptibility patterns of Streptococcus pneumoniae isolates.

Main Methods:

  • Retrospective analysis of culture-positive cases of Streptococcus pneumoniae from normally sterile body fluids.
  • Review of patient demographics, clinical diagnoses, predisposing conditions, and antibiotic sensitivity data.

Main Results:

  • Over 40% of patients were 5 years old or younger, and 28% were 50 years or older.
  • Meningitis (44%) and pneumonia (31%) were the most common clinical presentations.
  • Mortality was significantly higher in elderly patients (p = 0.0003).
  • All analyzed Streptococcus pneumoniae isolates were sensitive to penicillin and/or amoxycillin.

Conclusions:

  • Invasive pneumococcal disease affects a bimodal age distribution, with a notable burden in both young children and the elderly.
  • Elderly patients face a significantly higher risk of mortality from IPD.
  • Current penicillin and amoxycillin susceptibility provides treatment options, but ongoing surveillance is essential.

More Related Videos

Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination09:11

Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination

Published on: September 25, 2014

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/4306:06

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

Published on: September 11, 2020

Related Concept Videos

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 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...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
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...
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...