Related Experiment Video
Updated: Jul 27, 2026
15:43
Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice
Published on: March 18, 2014
The antibody response in chronic pyelonephritis.
Clinical Nephrology
|July 1, 1979
Summary
Antibody responses in urine infections are complex. While kidney infections typically show higher antibodies than bladder infections, distinguishing them by antibody levels alone is challenging due to various influencing factors.
Area of Science:
- Urology
- Immunology
- Infectious Diseases
Background:
- Urinary tract infections (UTIs) are common, with varying degrees of severity.
- Distinguishing upper UTIs (kidney involvement) from lower UTIs (bladder involvement) is crucial for effective treatment.
- Antibody responses are a key indicator of the body's reaction to bacterial infections.
Purpose of the Study:
- To investigate the correlation between serum antibody levels and the location of urinary tract infections.
- To determine if antibody titers can reliably differentiate between chronic pyelonephritis and asymptomatic bacteriuria.
Main Methods:
- Assayed serum antibodies specific to bacteria isolated from urine samples.
- Analyzed antibody titers in 41 patients with chronic pyelonephritis and 14 with asymptomatic bacteriuria.
Main Results:
- Infections involving the kidney generally elicit higher antibody responses than bladder infections.
- Establishing a definitive antibody titer cut-off to distinguish upper from lower UTIs proved difficult.
- 49% of chronic pyelonephritis patients had titers >= 1:400; 44% had titers between 1:50 and 1:100.
- A significant probability exists for upper UTIs to present without a strong antibody response.
Conclusions:
- The magnitude of antibody response in UTIs is influenced by infection location, bacterial strain immunogenicity, and host immune system factors.
- Antibody levels alone are insufficient for definitively distinguishing chronic pyelonephritis from asymptomatic bacteriuria.
- Further research is needed to identify reliable biomarkers for UTI localization.
Related Concept Videos
01:36Humoral Immune Responses
Overview
01:25Urinary Tract Infection II: Pathophysiology
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...
01:27Acute Pyelonephritis I: Introduction
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 as Proteus,...
01:28Acute Pyelonephritis II: Diagnostic Studies and Management
Introduction:For diagnosing acute pyelonephritis, a comprehensive patient history is collected to identify symptoms such as dysuria, frequent or urgent urination, flank pain, or costovertebral angle (CVA) tenderness that may suggest a kidney infection.Physical ExaminationDuring the physical examination, CVA tenderness is assessed. This involves gentle percussion over the costovertebral angle, where tenderness often indicates a kidney infection.Diagnostic TestsUrinalysis: Used to identify white...
01:29Acute Kidney Injury II: Pathophysiology
Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
01:29Acute Kidney Injury III: Clinical Manifestations
Acute Kidney Injury (AKI) progresses through distinct clinical phases: the oliguric, diuretic, and recovery phases, each marked by unique manifestations and challenges.Oliguric Phase:The oliguric phase is the initial stage of AKI, typically lasting 10 to 14 days. This phase is marked by a significant reduction in urine output, usually less than 400 mL per day, indicating decreased kidney function. Fluid retention is a prominent feature, leading to symptoms such as edema, hypertension, and...