[Studies on coagulase negative Staphylococci isolated from urine]

Area of Science:

• Microbiology
• Clinical Diagnostics
• Epidemiology

Context:

• Urinary tract infections (UTIs) are common, with bacterial pathogens playing a crucial role.
• Staphylococci, including Staphylococcus aureus and coagulase-negative Staphylococci (CNS), are significant causes of UTIs.
• Understanding the prevalence and specific species distribution of Staphylococci in urine is vital for effective treatment and infection control.

Purpose:

• To investigate the relative frequency and trends of Staphylococcus species, specifically Staphylococcus aureus and CNS, isolated from urine samples.
• To identify the predominant CNS species and their clinical associations in a hospital setting.
• To evaluate the role of Staphylococcus saprophyticus as a pathogen in acute UTIs.

Summary:

• A decade-long study (1984-1994, excluding 1992-1993) at Juntendo University Hospital, Tokyo, analyzed urine isolates.
• Staphylococci spp. accounted for approximately 10% of cases, with a gradual increase in Staphylococcus aureus frequency observed from 1986.
• Among 321 CNS isolates (1989-1994), Staphylococcus epidermidis (36%), Staphylococcus saprophyticus (26%), and Staphylococcus haemolyticus (22%) were most common. Staphylococcus saprophyticus was linked to acute UTIs in female outpatients, while Staphylococcus caprae was exclusively found in male patients. Staphylococcus epidermidis was frequently isolated from inpatients with concurrent urinary tract issues.

Impact:

• Provides epidemiological data on Staphylococcus urinary isolates, aiding in understanding local resistance patterns and informing empirical treatment strategies.
• Highlights Staphylococcus saprophyticus as a significant pathogen in female UTIs, emphasizing the need for species-specific diagnostic considerations.
• Contributes to the knowledge base for managing Staphylococcal urinary tract infections in hospital settings and outpatient populations.