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Related Concept Videos

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 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 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...
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,...
Malaria01:29

Malaria

Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
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Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...

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Inducing Meningococcal Meningitis Serogroup C in Mice via Intracisternal Delivery
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Published on: November 5, 2019

Meningococcal interactions with the host.

Etienne Carbonnelle1, Darryl J Hill, Philippe Morand

  • 1INSERM, unité 570, Université Paris Descartes, 156 rue de Vaugirard, Paris 75015, France.

Vaccine
|June 2, 2009
PubMed
Summary
This summary is machine-generated.

Neisseria meningitidis uses adhesins like pili, Opa, and Opc to attach to and invade host cells. These adhesins also help the bacteria evade the immune system, contributing to infection susceptibility.

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Area of Science:

  • Microbiology
  • Immunology
  • Cell Biology

Background:

  • Neisseria meningitidis employs various adhesins for host tissue interaction.
  • Antigenic and phase variation of adhesins is a key immune evasion strategy.
  • Pili, Opa, and Opc are crucial for bacterial adhesion, host specificity, and invasion.

Purpose of the Study:

  • To examine the mechanisms of Neisseria meningitidis adhesion and invasion.
  • To understand the role of adhesins in host cell interaction.
  • To investigate the importance of adhesin-receptor pairs in infection susceptibility.

Main Methods:

  • Review of current literature on meningococcal adhesion and invasion.
  • Analysis of the functions of pili, Opa, and Opc proteins.
  • Examination of interactions with human epithelial and endothelial cells.

Main Results:

  • Pili, Opa, and Opc significantly influence bacterial adhesion to host cells.
  • Opa and Opc facilitate efficient cellular invasion.
  • Specific adhesin-receptor interactions may increase host susceptibility to infection.

Conclusions:

  • Adhesins play a central role in Neisseria meningitidis pathogenesis.
  • Understanding these mechanisms is crucial for combating meningococcal diseases.
  • Further research into adhesin-receptor dynamics can inform strategies against infection.