How does Neisseria meningitidis affect the body?
Bacteria that cause meningococcal disease can also infect the blood, causing septicemia. Symptoms of septicemia include tiredness, vomiting, chills, severe aches and pain, fast breathing, diarrhea, and a dark rash. Meningococcal disease can lead to death in as little as a few hours.
How does Neisseria meningitidis infect cells?
Neisseria meningitidis, a common cause of sepsis and bacterial meningitis, infects the meninges and central nervous system (CNS), primarily via paracellular traversal across the blood-brain barrier (BBB) or blood-cerebrospinal fluid barrier.
How does Neisseria meningitidis infect different organs?
Meningococcal meningitis evolves when the bacteria, Neisseria meningitidis (N. meningitidis) progresses from initial adherence to the nasopharyngeal (nose and throat) mucosa to invasion of the deeper mucosal layers (the submucosa). These bacteria rapidly multiply, and can lead to a mild (subclinical) infection.
Where does Neisseria meningitidis infect?
Meningococcal meningitis is a severe bacterial infection of the membrane that covers the brain and spinal cord.
Does Neisseria meningitidis produce Exotoxins?
Virulence Factors For a time, the virulence of Neisseria meningitidis was attributed to the production of an “exotoxin” that could be recovered from culture filtrates of the organism.
What are virulence factors and examples?
Factors that are produced by a microorganism and evoke disease are called virulence factors. Examples are toxins, surface coats that inhibit phagocytosis, and surface receptors that bind to host cells.
What is virulence in bacteria?
Virulence is described as an ability of an organism to infect the host and cause a disease. Virulence factors are the molecules that assist the bacterium colonize the host at the cellular level.
What causes virulence?
The degree of virulence is related directly to the ability of the organism to cause disease despite host resistance mechanisms; it is affected by numerous variables such as the number of infecting bacteria, route of entry into the body, specific and nonspecific host defense mechanisms, and virulence factors of the …
What factors influence the virulence of nitrogen meningitidis?
The virulence (14) of N. meningitidisis influenced by multiple factors: capsule polysaccharide expression, expression of surface adhesive proteins (outer membrane proteins including pili, porins PorA and B, adhesion molecules Opa and Opc), iron sequestration mechanisms, and endotoxin (lipooligosaccharide, LOS).
What is the virulence of meningococcus?
Virulence factors in meningococci It is well established that meningococcus strains vary in virulence from non-invasive to highly invasive. This review, based on the literature, presents some of the characteristics of the bacteria that may be of importance for their virulence. It is assumed that factors such as production of an IgA1 …
What is the pathophysiology of Neisseria meningitidis?
Abstract Neisseria meningitidis(the meningococcus) causes significant morbidity and mortality in children and young adults worldwide through epidemic or sporadic meningitis and/or septicemia. In this review, we describe the biology, microbiology, and epidemiology of this exclusive human pathogen.
What is bacterial meningitis?
Introduction Bacterial meningitis, as are bacterial encephalitis and meningoencephalitis, is an inflammatory disease of the central nervous system (CNS). It can be diagnosed by the presence of bacteria in the CNS.