Related Experiment Video
Updated: Jun 24, 2026
03:53
Growing a Cystic Fibrosis-Relevant Polymicrobial Biofilm to Probe Community Phenotypes
Published on: April 19, 2024
Current bacteriology of suppurative otitis: resistant patterns and outcomes analysis
James E Saunders1, Ryan Palivela Raju, Jonathan Boone
1Department of Otolaryngology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire 03756, USA. ryan-raju@ouhsc.edu
Summary
Previous antibiotic use increases bacterial resistance in otitis externa cases. Managing draining ear infections with resistant bacteria leads to higher treatment failure rates, highlighting the importance of cultures.
Area of Science:
- Otolaryngology
- Infectious Diseases
- Medical Microbiology
Background:
- Antibiotic resistance complicates the management of draining ear conditions.
- Understanding factors predisposing to resistance is crucial for effective treatment.
Purpose of the Study:
- To examine factors predisposing to antibiotic resistance in patients with otorrhea.
- To evaluate the role of microbial cultures in managing these infections.
Main Methods:
- Retrospective chart review of patients with otorrhea over a 3-year period.
- Analysis of demographic factors, diagnoses, prior antibiotic use, isolated organisms, resistance patterns, and treatment efficacy.
Main Results:
- Previous antibiotic use significantly increased resistance in otitis externa (p=0.01).
- Previous quinolone use correlated with increased quinolone resistance (p=0.01).
- High treatment failure rates (50%) occurred with highly resistant bacteria (p=0.01), and cultures guided treatment changes in 21% of cases.
Conclusions:
- Prior antibiotic exposure is linked to heightened bacterial resistance, particularly in otitis externa.
- Infections with highly resistant bacteria are associated with increased treatment failure.
- Microbial cultures are vital for managing refractory otorrhea.
Related Concept Videos
01:25Mechanism of Antibiotic Resistance in MRSA
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
01:25Clinical Significance of Antibiotic Resistance
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
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...
01:31Defense Against Bacterial Pathogens
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.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
01:29Microbiota of the Respiratory Tract
The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...
01:26Urine Studies II: Urine Culture and Sensitivity Test
A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...