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Related Concept Videos

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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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...
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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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Bacterial meningitis is a severe infectious disease involving inflammation of the meninges, the protective membranes surrounding the brain and spinal cord. It occurs when pathogenic bacteria cross the blood–brain barrier and enter the cerebrospinal fluid. Common causative organisms include Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae type b, Listeria monocytogenes, and Escherichia coli K1. The exact route of entry varies by pathogen and host condition.Routes of Entry...
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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...
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Pneumonia III: Complications and Assessment

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

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Related Experiment Video

Updated: Jun 16, 2026

Inducing Meningococcal Meningitis Serogroup C in Mice via Intracisternal Delivery
10:03

Inducing Meningococcal Meningitis Serogroup C in Mice via Intracisternal Delivery

Published on: November 5, 2019

Experimental studies of pneumococcal meningitis.

Christian T Brandt1

  • 1National Center for Antimicrobials and Infection Control, Statens Serum Institut, Denmark. ctb@ssi.dk

Danish Medical Bulletin
|February 24, 2010
PubMed
Summary

This study on pneumococcal meningitis in rats found that while local inflammation causes brain injury, systemic infection drives disease severity and fatal outcomes. Modulating the host response can improve survival but not prevent focal brain damage.

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Area of Science:

  • Neuroscience
  • Infectious Diseases
  • Immunology

Background:

  • Host inflammatory response significantly impacts outcomes in invasive infections, even with antimicrobial treatment.
  • Pneumococcal meningitis research is crucial due to its severe consequences.
  • Understanding the interplay between local and systemic inflammation is key to improving patient outcomes.

Purpose of the Study:

  • To investigate how local meningeal inflammation and systemic infection modulate pneumococcal meningitis course.
  • To clarify the dual role of the inflammatory response in disease severity and outcome.
  • To explore therapeutic strategies targeting host inflammation.

Main Methods:

  • Development and optimization of a rat model for pneumococcal meningitis.
  • Evaluation of clinical scores, hearing loss (otoacoustic emission), and brain pathology (histology, MRI).
  • Modulation of inflammatory response using G-CSF, a selectin blocker (fucoidin), and serotype-specific antibodies.

Main Results:

  • Focal brain injury resulted from local meningeal infection, while systemic infection determined clinical severity and outcome.
  • Systemic disease significantly increased blood-brain barrier permeability and ventricle expansion.
  • Augmented systemic host response reduced bacterial load and mortality but did not prevent focal brain injury.

Conclusions:

  • Meningitis sequelae stem from local complications; fatal outcomes are accelerated by systemic infection.
  • Understanding the systemic-local inflammation interplay can optimize treatment for complications like increased intracranial pressure and brain edema.
  • Future therapeutic and preventive strategies (vaccines, targeted anti-inflammatory agents) are essential for improving survival and neurological outcomes.