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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...
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,...
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...
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...

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Related Experiment Video

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Visualisation and Quantification of Intracellular Interactions of Neisseria meningitidis and Human α-actinin by Confocal Imaging
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Published on: October 25, 2010

[Correlation between rainfall and meningococcal meningitis in Niger].

M Jackou-Boulama1, R Michel, L Ollivier

  • 1Département d'epidémiologie et de santé publique, Epidémiologiste au CERMES de Niamey. m.jackou@free.fr

Medecine Tropicale : Revue Du Corps De Sante Colonial
|March 22, 2006
PubMed
Summary

Rainfall significantly impacts meningococcal meningitis outbreaks in Niger's "meningitis belt." Lower rainfall correlates with higher disease incidence, highlighting the need for integrated prevention strategies beyond simple threshold rates.

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Area of Science:

  • Epidemiology
  • Infectious Disease Dynamics
  • Environmental Health

Context:

  • The "meningitis belt" in Africa experiences seasonal epidemic meningitis.
  • Niger, a key region within this belt, reported over 58,000 meningococcal meningitis cases between 1996 and 2002.
  • Epidemic meningitis incidence in Niger is known to fluctuate with seasonal changes.

Purpose:

  • To investigate the statistical relationship between recorded rainfall and the incidence of meningococcal meningitis in Niger.
  • To analyze epidemiological data from 1996 to 2002 to understand disease patterns.
  • To identify environmental factors influencing meningitis outbreaks in the region.

Summary:

  • A statistically significant negative correlation (r = -0.27, P = 0.01) was found between rainfall and meningococcal meningitis incidence.
  • Meningococcal meningitis incidence increased during the dry season and decreased with the onset of the rainy season.
  • Neisseria meningitidis serogroup A was predominant, with emerging serogroup W135 strains noted post-2002.

Impact:

  • Findings suggest rainfall is a critical factor in meningococcal meningitis epidemics in Niger.
  • Highlights the limitations of solely relying on threshold-based prediction strategies.
  • Advocates for multivariate analysis to implement earlier and more effective preventive measures against meningitis outbreaks.