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Pneumonia I: Introduction

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 II: Pathophysiology

Pneumonia II: Pathophysiology

The pathophysiology of pneumonia involves the following steps:

Pneumonia III: Complications and Assessment

Pneumonia III: Complications and Assessment

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

Atypical Pneumonia

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: Pathophysiology

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: Introduction

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...

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Updated: Jul 12, 2026

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

Published on: January 17, 2014

Pneumococci causing invasive disease in Britain 1982-1990

G Colman¹, E M Cooke, B D Cookson

¹Division of Hospital and Respiratory Infection, Central Public Health Laboratory, London.

Journal of Medical Microbiology

|February 5, 1998

Summary

Streptococcus pneumoniae isolates show increasing antibiotic resistance, particularly multi-resistance in common serotypes like 6 and 23. This highlights a growing public health concern for invasive pneumococcal diseases.

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Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

Published on: September 11, 2020

Area of Science:

Microbiology
Infectious Diseases
Public Health

Background:

Streptococcus pneumoniae is a leading cause of bacterial pneumonia, meningitis, and bloodstream infections worldwide.
Antibiotic resistance in S. pneumoniae poses a significant threat to effective treatment of these invasive pneumococcal diseases.
Serotyping is crucial for understanding pneumococcal epidemiology and disease burden.

Purpose of the Study:

To serotype and screen a large collection of Streptococcus pneumoniae isolates for antibiotic insusceptibility.
To identify prevalent serotypes causing invasive pneumococcal disease and their antibiotic resistance patterns.
To track trends in antibiotic resistance, including multi-resistance, in S. pneumoniae isolates.

Main Methods:

Serotyping of 5348 Streptococcus pneumoniae isolates.
Screening for insusceptibility to tetracycline, penicillin, erythromycin, and chloramphenicol.
Analysis of isolate origins (pneumonia, meningitis, bacteremia) and serotype distribution.

Main Results:

79% of isolates were from patients with pneumonia, meningitis, or bacteremia.
74% of isolates belonged to serotypes 1, 3, 4, 6, 8, 9, 14, 19, or 23.
14% of isolates (768) were insusceptible to at least one antibiotic, with 591 belonging to serotypes 6, 9, 14, 19, or 23.
Erythromycin-resistant type 14 isolates increased from 1986.
Multi-resistant pneumococci increased from 1985, including type 23 (penicillin, chloramphenicol, tetracycline resistant) and type 6 (additionally erythromycin resistant).

Conclusions:

Specific serotypes (6, 14, 19, 23) are frequent causes of invasive pneumococcal disease.
A significant proportion of S. pneumoniae isolates exhibit insusceptibility to common antibiotics.
Increasing trends in multi-resistant pneumococci, particularly in key serotypes, necessitate ongoing surveillance and intervention strategies.