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Bacterial Meningitis I: Introduction

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...

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...

Bacterial Meningitis

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Microbiota of the Respiratory Tract

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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...

Tonsillitis I: Introduction

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Tonsillitis is inflammation of the tonsils, which are two lymphoid tissue masses at the back of the throat. This condition can cause discomfort and irritation in the throat.
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Viral Meningitis

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Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...

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Updated: Jun 16, 2026

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia

Published on: June 28, 2018

Insights into infectious otitis media.

P Marchisio¹, S Bianchini, P Capaccio

¹Departments of Mother and Child, University of Milan, Policlinico, Mangiagalli e Regina Elena, Milan, Italy.

International Journal of Immunopathology and Pharmacology

|February 16, 2010

Summary

This summary is machine-generated.

Otitis media, a common childhood illness, is caused by multiple factors. Recent research offers new insights into its microbiology, potentially improving treatment and prevention strategies for this public health concern.

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Last Updated: Jun 16, 2026

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia

Published on: June 28, 2018

Area of Science:

Otolaryngology
Pediatrics
Microbiology

Background:

Otitis media is a significant public health issue, frequently diagnosed in children.
It causes immediate and long-term health problems (morbidity).
Established knowledge on risk factors and microbiology has remained consistent for years.

Purpose of the Study:

To present recent findings on the microbiological aspects of otitis media.
To explore how new data can inform therapeutic and preventive strategies.

Main Methods:

Review of recent research and data on otitis media microbiology.
Analysis of emerging trends in understanding the disease's causative agents.

Main Results:

New data have emerged regarding the diverse microbiological landscape of otitis media.
These findings expand upon previous, long-standing knowledge.

Conclusions:

Recent microbiological insights offer potential for novel therapeutic interventions.
This evolving knowledge is crucial for developing advanced preventive strategies against otitis media.