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Related Experiment Videos

Streptococci as urinary pathogens.

L E Collins, R W Clarke, R Maskell

    Lancet (London, England)
    |August 30, 1986
    PubMed
    Summary
    This summary is machine-generated.

    This study identified numerous catalase-negative gram-positive cocci and coccobacilli in urine specimens, finding many species beyond common streptococci. A practical isolation protocol for busy labs is proposed.

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    Area of Science:

    • Clinical Microbiology
    • Urology
    • Bacteriology

    Background:

    • Streptococci are common in urine specimens.
    • Accurate identification of urinary tract pathogens is crucial for effective treatment.
    • Certain fastidious bacteria may be overlooked in routine laboratory settings.

    Purpose of the Study:

    • To identify catalase-negative gram-positive cocci and coccobacilli from urine specimens.
    • To assess the prevalence of non-streptococcal species.
    • To propose an improved isolation protocol for clinical laboratories.

    Main Methods:

    • Prospective study of 11,725 urine specimens over 2 months.
    • Isolation and species identification of 242 strains of catalase-negative gram-positive cocci/coccobacilli.

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  • Use of cysteine-lactose-electrolyte-deficient agar and carbon dioxide incubation.

    • Main Results:

    • 242 strains were isolated, comprising 10% of important isolates.
    • 30% of isolates were species other than Streptococcus faecalis and S. agalactiae.
    • Gardnerella vaginalis accounted for 20 of 24 coccobacilli isolates; many fastidious species were associated with pyuria.

    Conclusions:

    • Urinary tract infections involve a broader range of catalase-negative gram-positive cocci and coccobacilli than commonly identified.
    • Routine laboratory methods may miss certain fastidious organisms.
    • A modified isolation protocol can enhance the detection of these pathogens.