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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...
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...
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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Epidemiological and molecular characterization of Streptococcus pneumoniae carriage strains in pre-school children in Arkhangelsk, northern European Russia, prior to the introduction of conjugate pneumococcal vaccines.

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Meningococcal carriage in Norwegian teenagers: strain characterisation and assessment of risk factors.

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Epidemiology of invasive group A streptococcal infections in Norway 2010-2014: A retrospective cohort study.

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Salivary and Serum Antibody Response Against Neisseria meningitidis After Vaccination With Conjugate Polysaccharide Vaccines in Ethiopian Volunteers.

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Related Experiment Video

Updated: Jun 4, 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

Global trends in meningococcal disease.

D A Caugant1

  • 1Department of Bacteriology, National Institute of Public Health, Oslo, Norway.

Methods in Molecular Medicine
|February 22, 2011
PubMed
Summary

Accurate identification of epidemic Neisseria meningitidis strains is crucial for tracking global disease spread. Multi-locus enzyme electrophoresis (MEE) was historically vital for analyzing these strains and their international dissemination.

Area of Science:

  • Microbiology
  • Epidemiology
  • Molecular typing

Background:

  • Distinguishing epidemic Neisseria meningitidis strains is essential for understanding meningococcal disease epidemiology.
  • Accurate strain identification aids in tracking the global spread of pathogenic bacteria.

Purpose of the Study:

  • To highlight the historical importance of multi-locus enzyme electrophoresis (MEE) in meningococcal strain analysis.
  • To underscore the need for reliable methods in identifying epidemic strains of Neisseria meningitidis.

Main Methods:

  • Review of historical epidemiological studies utilizing bacterial strain typing.
  • Discussion of multi-locus enzyme electrophoresis (MEE) as a primary analytical tool.

Main Results:

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Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

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Last Updated: Jun 4, 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

Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43
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Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43

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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Published on: February 23, 2014

  • Multi-locus enzyme electrophoresis (MEE) enabled large-scale analysis of Neisseria meningitidis strains globally.
  • MEE facilitated the documentation of intercontinental spread of pathogenic meningococcal strains.

Conclusions:

  • Multi-locus enzyme electrophoresis (MEE) was a foundational method for meningococcal epidemiology.
  • The ability to identify and distinguish pathogenic strains is critical for global health surveillance.