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Related Concept Videos

Urinary Tract Infection II: Pathophysiology01:25

Urinary Tract Infection II: Pathophysiology

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Gastritis is marked by disruption of the mucosal barrier that usually protects the stomach tissue from digestive juices and manifests in acute and chronic forms.
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Pyelonephritis is a bacterial infection that primarily affects the renal parenchyma and collecting system, including the renal pelvis, tubules, and interstitial tissue of one or both kidneys. It can be classified as either acute—a sudden, severe infection—or chronic, which refers to long-term or recurrent kidney infections.The primary cause of acute pyelonephritis (APN) is bacterial infection, with Escherichia coli accounting for approximately 70-80% of cases. Other bacteria, such...
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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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Related Experiment Video

Updated: Aug 14, 2025

Primed Mycobacterial Uveitis PMU as a Model for Post-Infectious Uveitis
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Pathogenesis of Bacterial Uveitis.

Gerhild Wildner1, Reema Bansal2, Nikitha Ayyadurai2

  • 1Department of Ophthalmology, University Hospital, LMU, Munich, Germany.

Ocular Immunology and Inflammation
|January 9, 2023
PubMed
Summary

Bacterial uveitis, an eye inflammation, occurs via extra- or intracellular bacteria. Understanding these pathogens and immune responses aids early diagnosis and treatment for better visual outcomes.

Keywords:
Adaptive immunityLyme diseasebartonellosisborreliosisbrucellosisinnate immunitypathogenesissyphilistuberculosisuveitis

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Area of Science:

  • Ophthalmology
  • Immunology
  • Microbiology

Background:

  • Bacterial uveitis is a significant cause of vision loss.
  • Understanding the immune mechanisms is crucial for effective treatment.

Approach:

  • This study presents a narrative review of bacterial uveitis.
  • It focuses on the pathogenesis and immune responses involved.

Key Points:

  • Both extracellular and intracellular bacteria can cause uveitis.
  • Intracellular bacteria often use macrophages for transport into the eye.
  • Immune cells like T and B cells trigger inflammation, potentially damaging intraocular tissues.

Conclusions:

  • Recognizing pathogenic mechanisms is key for early diagnosis.
  • Correlating clinical and imaging findings with microbial factors guides therapy.