Epidemiological Evidence Supports the Role of Microbial Interactions in Polymicrobial UTI Infections Revealed by In
Gabriella Piatti1,2, Alessandro Mannini3, Alberto Vitale2
1DISC-Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, 16132 Genoa, Italy.
Antibiotics (Basel, Switzerland)
|October 28, 2025
Summary
Certain microbes show a numerical advantage in polymicrobial urinary tract infections, suggesting synergistic interactions that promote co-infections, independent of patient health status.
Area of Science:
- Microbiology
- Epidemiology
- Infectious Diseases
Background:
- Polymicrobial infections, particularly in the urinary tract, are increasingly recognized due to advanced molecular identification techniques.
- While in vitro studies suggest microbial interactions in co-infections, their clinical significance is often confounded by patient health conditions.
- Understanding the distinct roles of specific microorganisms versus host factors in polymicrobial infections is crucial.
Purpose of the Study:
- To differentiate the contributions of individual microorganisms and patient conditions in polymicrobial urinary tract infections.
- To conduct an epidemiological analysis of polymicrobial urinary samples to clarify microbial roles.
- To investigate microbial interactions and their clinical relevance in urinary tract co-infections.
Main Methods:
- Retrospective analysis of 24,067 urine cultures from a large Italian hospital over one year.
- Classification of patients into uncompromised and compromised groups, and cultures into monomicrobial and polymicrobial categories.
- Multivariate logistic regression was used to assess associations between microorganisms and sample/patient groups, adjusting for seven confounding variables.
Main Results:
- Out of 7208 positive cultures, 75% were monomicrobial and 25% polymicrobial.
- Polymicrobial samples exhibited a broader microbial diversity compared to monomicrobial ones.
- Specific microorganisms demonstrated a numerical advantage in polymicrobial samples, irrespective of host conditions, indicating potential synergistic effects.
Conclusions:
- Certain microorganisms possess inherent advantages in polymicrobial urinary tract infections, suggesting synergistic interactions.
- These findings support the hypothesis that microbial synergies play a role in the development of specific co-infections.
- The study provides epidemiological evidence for microbial cooperation in the context of human urinary tract infections.
Related Concept Videos
01:25Urinary Tract Infection II: Pathophysiology
559
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...
559
01:30Urinary Tract Infection III: Diagnostic Studies and Interprofessional Care
246
A healthcare provider can diagnose a urinary tract infection (UTI) through several methods:Medical History and Symptoms: The provider will take a detailed medical history and ask about symptoms such as frequent urination, burning sensation during urination, and lower abdominal pain.Urinalysis: A clean-catch urine sample is collected in a sterile container and tested for the presence of bacteria, white blood cells (leukocytes), nitrites, blood, and protein. The presence of leukocytes and...
246
01:26Urine Studies II: Urine Culture and Sensitivity Test
824
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...
824
01:26Urinary Tract Infection I: Introduction
528
Urinary tract infections (UTIs) impact various parts of the urinary system, including the kidneys, ureters, bladder, and urethra. These infections are generally bacterial, with Escherichia coli being the most common causative agent, often originating from the gastrointestinal tract. However, other bacteria, such as Staphylococcus saprophyticus, Klebsiella pneumoniae, and Proteus mirabilis, are also known to cause UTIs. The type, location, and underlying complexity of the UTI guide both...
528
01:18Surface Membrane Barriers
2.6K
The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
2.6K
01:27Combined Effects of Drugs: Synergism
6.7K
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...
6.7K