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The bacteriological examination of urine: a computer-aided study
Insights
Urinary tract infections (UTIs) in hospital and general practice settings show significant differences in patient demographics, causative organisms, and antimicrobial drug sensitivities. These variations mean findings from one setting cannot be generalized to the other.
Area of Science:
- Clinical Microbiology
- Infectious Diseases
- Public Health
Background:
- Urinary tract infections (UTIs) are common, but their epidemiology can vary significantly between healthcare settings.
- Understanding these differences is crucial for effective diagnosis, treatment, and prevention strategies.
- Previous studies may not have adequately distinguished between hospital-acquired and community-acquired UTIs.
Purpose of the Study:
- To compare the characteristics of UTIs in hospital patients versus those in general practice.
- To analyze the age and sex distribution of UTI patients in different healthcare settings.
- To determine the types of causative organisms and their antimicrobial sensitivity patterns based on the origin of the infection.
Main Methods:
- A 6-month retrospective analysis of 15,606 urine samples submitted for bacteriological examination.
- Data collected included patient demographics (sex, age), origin of request (hospital vs. general practice), urine analysis results (protein, cells), culture findings, and isolated organism sensitivities.
- Statistical analysis, including rate adjustments for age and sex distribution, was used to compare findings between hospital and general practice cohorts.
Main Results:
- Significant disparities were observed in the age and sex distribution of patients with UTIs between hospital and general practice settings.
- The spectrum of causative organisms and their antimicrobial sensitivity profiles differed markedly between the two settings.
- The presence of inflammatory exudate in urine was investigated in relation to bacteriologically confirmed infections and the capacity of specific organisms to induce it.
Conclusions:
- Hospital and general practice experiences with UTIs are substantially different regarding patient demographics, causative agents, and drug sensitivities.
- Findings from UTI studies conducted in either hospital or general practice settings alone are not generalizable to the other.
- Mixed population studies require careful consideration of the relative contributions of each setting to avoid biased conclusions.
Abstract:
For 6 months details of every patient who had his or her urine sent to a laboratory for bacteriological examination and the result of such examination were entered on a computer-card. A total of 15,606 cards were completed with information in code recording the sex and age of a patient, the origin of the request, the presence or absence in the urine of an excess of protein or cells, the culture result and the name of any significant organism isolated together with its sensitivity to various antimicrobial drugs. This information was interrelated in a computer, and in some cases the resulting numerical details were expressed as rates so as to eliminate the effect of uneven sex and age distribution. In this way the occurrence of urinary tract infection and the type of infecting organism in persons of either sex at various ages was examined according to whether the patient was in hospital or general practice. The sensitivity pattern of each type of significant organism isolated was established according to its source. The association between patients of either sex and various ages who had, or did not have, bacteriologically evident infections and the presence in their urine of an inflammatory exudate was investigated. Finally, the capacity of each type of infecting organism to produce such an exudate was estimated.It was shown that hospital and general practice experience of urinary tract infections differed widely, with regard both to the age and sex distribution of those suffering from it, and to the causative organisms concerned and their sensitivities to antimicrobial drugs. It is suggested that these differences were so great that conclusions drawn from any study of this subject conducted in one of the two areas cannot be applied to the other, and that those derived from a mixture of the two will vary according to the relative sizes of each of the components.