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Related Concept Videos

Bacterial Meningitis I: Introduction01:22

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 Meningitis01:24

Bacterial Meningitis

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...
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...
Viral Meningitis01:18

Viral Meningitis

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...
Cryptococcal Meningitis01:27

Cryptococcal Meningitis

Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...
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Drugs for Treatment of Crohn's Disease in IBD Using Glucocorticoids

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Related Experiment Video

Updated: Jun 9, 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

Corticosteroids for acute bacterial meningitis.

Matthijs C Brouwer1, Peter McIntyre, Jan de Gans

  • 1Department of Neurology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center University of Amsterdam, P.O. Box 22700, Amsterdam, Netherlands, 1100 DE.

The Cochrane Database of Systematic Reviews
|September 9, 2010
PubMed
Summary

Corticosteroids for bacterial meningitis did not reduce overall mortality but significantly decreased hearing loss and neurological sequelae. Benefits were observed in high-income countries, particularly for severe hearing loss in Haemophilus influenzae meningitis.

Related Experiment Videos

Last Updated: Jun 9, 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

Area of Science:

  • Neurology
  • Infectious Diseases
  • Pharmacology

Background:

  • Bacterial meningitis outcomes correlate with subarachnoid space inflammation.
  • Corticosteroids are known to mitigate inflammatory responses.

Purpose of the Study:

  • To evaluate the efficacy of adjuvant corticosteroid therapy versus placebo in treating acute bacterial meningitis.
  • Assess impact on mortality, hearing loss, and neurological sequelae across all age groups.

Main Methods:

  • Systematic review and meta-analysis of randomized controlled trials (RCTs).
  • Searched major databases including Cochrane, MEDLINE, and EMBASE.
  • Subgroup analyses conducted for age, causative organisms, country income, and study quality.

Main Results:

  • No significant difference in overall mortality between corticosteroid and placebo groups (18.0% vs 20.0%).
  • Corticosteroids associated with reduced severe hearing loss (RR 0.67) and neurological sequelae (RR 0.83).
  • Benefits, including reduced hearing loss, were more pronounced in high-income countries and for specific pathogens like Haemophilus influenzae.

Conclusions:

  • Corticosteroids effectively reduce hearing loss and neurological sequelae in bacterial meningitis.
  • Overall mortality benefit was not demonstrated.
  • Therapeutic use is supported in high-income settings, with no observed benefit in low-income countries.