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American Journal of Epidemiology Vol. 130, No. 6: 1176-1186
Copyright © 1989 by The Johns Hopkins University School of Hygiene and Public Health

research-article

BACTERIURIA IN REPRESENTATIVE POPULATION SAMPLES OF PERSONS AGED 72–79 YEARS

G. NORDENSTAM1,2, V. SUNDH2, K. LINCOLN3, A. SVANBORG2 4 and C. SVANBORG EDÉN1

1Department of Clinical Immunology, University of Goteborg, Guldhedsgatan 10 S-41346 Goteborg, Sweden
2Department of Geriatrics and Long-term Care Medicine, University of Goteborg Goteborg, Sweden
3Department of Clinical Bacteriology, University of Goteborg Gdteborg, Sweden

Screening for bacteriuria was performed between 1984 and 1988 in persons aged 72–79 years representative of the general population in Göteborg, Sweden. The frequency of bacteriuria (≥105/ml) at a single screening was 6% and 16% at age 72 years and 6% and 14% at age 79 years for the screened men (n = 235 and 259) and women (n = 259 and 297), respectively. By repeated screening after one month and 30 months of those previously negative at age 72 years, an additional 4% and 3% of men and 3% and 7% of women with bacteriuria were detected. Bacteriuric persons were excluded from further screening and controlled by frequent cultures during several years, with careful monitoring of clinical interventions. The persistence of untreated bacteriuria was analyzed in relation to bacterial species and number in the untreated subgroup of bacteriuric individuals. Nine of 10 Escherlchla coli (E. coli) with <105/ml and 22/22 non-E. coli strains disappeared spontaneously. In contrast, 20/26 (77%, p < 0.01) with ≥105 E. coli/ml persisted. Of 17 persons with bacteriuria persisting at least 12 months, 16 were women and 16 had E. coli. Of 201 E. coli cultures obtained from this group, 94% had ≥105/ml, and 99% had ≥5 x 105/ml. The results indicate that screening for high counts (x105/ml) of E. coli most effectively detects persisting bacteriuria in the general elderly population.

bacteriuria; Escherlchla coli

4Present address: Department of Medicine, Section of Geriatric Medicine, University of Illinois at Chicago, Chicago, IL.


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