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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...
Mitral Stenosis III: Medical Management01:26

Mitral Stenosis III: Medical Management

Mitral stenosis, a condition marked by the narrowing of the mitral valve, necessitates an integrated approach for effective management. This approach includes preventative measures, medical therapy, and surgical interventions to reduce symptoms and prevent complications.PreventionPrevention of mitral stenosis primarily focuses on reducing the incidence of bacterial infections, particularly streptococcal infections, which can lead to rheumatic fever and subsequent valvular damage. Timely...
Rocky Mountain Spotted Fever01:26

Rocky Mountain Spotted Fever

Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.

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Related Experiment Video

Updated: Jul 6, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

Community-acquired Streptococcus mitis meningitis: a case report.

Selda Sayin Kutlu1, Suzan Sacar, Nural Cevahir

  • 1Department of Infectious Diseases and Clinical Microbiology, Faculty of Medicine, Pamukkale University, Kinikli, 20070 Denizli, Turkey. sayinkutlu@yahoo.com

International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases
|April 2, 2008
PubMed
Summary

Streptococcus mitis meningitis is rare but serious. This case highlights risk factors like older age, alcoholism, and poor oral hygiene, emphasizing prompt diagnosis and treatment for better outcomes.

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Last Updated: Jul 6, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
12:18

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)

Published on: February 9, 2011

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Neurology

Background:

  • Streptococcus mitis is common in human flora but can cause severe infections like endocarditis.
  • Meningitis due to S. mitis is infrequent, typically seen in immunocompromised individuals or those with specific medical histories.
  • Risk factors for S. mitis meningitis include prior spinal anesthesia, neurosurgery, malignancy, or neurological issues from endocarditis.

Observation:

  • A 58-year-old male with a history of alcoholism presented with fever, headache, and altered mental status.
  • Cerebrospinal fluid analysis confirmed meningitis caused by S. mitis.
  • The patient received a 14-day course of ampicillin.

Findings:

  • The isolated S. mitis strain was susceptible to penicillin.
  • The patient achieved a complete clinical recovery after treatment.

Implications:

  • This case underscores the significance of S. mitis meningitis in patients with specific risk factors.
  • Identifying risk factors such as advanced age (>50), alcoholism, poor oral hygiene, and maxillary sinusitis is crucial for early detection.
  • Prompt diagnosis and appropriate antibiotic therapy are essential for managing S. mitis meningitis and improving patient prognosis.