Incidence of Pseudomonas aeruginosa bacteremia: a population-based study.
BACKGROUND
The incidence of Pseudomonas aeruginosa bacteremia has not been defined in a population-based investigation.


METHODS
We performed a retrospective, population-based incidence study using resources of the Rochester Epidemiology Project of Olmsted County, Minnesota. We identified all Olmsted County residents with P. aeruginosa bacteremia between January 1, 1997, and December 31, 2006, by microbiology records in the only 2 laboratories in the county. Medical records were reviewed to confirm diagnosis, residency status, and clinical characteristics.


RESULTS
Age-adjusted incidence per 100,000 person-years was 10.8 (95% confidence interval [CI], 7.5-14.0) in men and 3.7 (95% CI, 2.2-5.2) in women for total P. aeruginosa bacteremia, and 8.4 (95% CI, 5.5-11.2) in men and 2.5 (95% CI, 1.3-3.8) in women for monomicrobial P. aeruginosa bacteremia. There was no significant change in incidence of total P. aeruginosa bacteremia during the past decade (P=.418). Incidence increased exponentially with age, with a greater magnitude of increase in men compared with women for total and monomicrobial P. aeruginosa bacteremia (P=.007 and P=.015, respectively). In patients with monomicrobial P. aeruginosa bacteremia, the median age was 69 years, and 78.4% of cases were either nosocomial or health care associated. Most patients had multiple comorbid conditions. The urinary tract was the most common primary source of infection. The 28-day all-cause mortality of monomicrobial P. aeruginosa bacteremia was 25.5%. In vitro susceptibility to ciprofloxacin was 95.3%.


CONCLUSIONS
To our knowledge, this is the first population-based incidence study of P. aeruginosa bacteremia. The incidence of P. aeruginosa bacteremia has remained stable during the past decade. Fluoroquinolone susceptibility is high among local P. aeruginosa bacteremia isolates.
Al-Hasan
Majdi N
MN
Department of Medicine, Division of Infectious Diseases, College of Medicine, Mayo Clinic, Rochester, MN 55905, USA. alhasan.majdi@mayo.edu
Wilson
John W
JW
Lahr
Brian D
BD
Eckel-Passow
Jeanette E
JE
Baddour
Larry M
LM
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D016470:Bacteremia / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D008910:Minnesota / Q000453:epidemiology; D011552:Pseudomonas Infections / Q000453:epidemiology*; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D012189:Retrospective Studies; D017678:Sex Distribution; D013997:Time Factors