Determinants of Clostridium difficile Infection Incidence Across Diverse United States Geographic Locations.

Abstract:

BACKGROUND:Clostridium difficile infection (CDI) is no longer restricted to hospital settings, and population-based incidence measures are needed. Understanding the determinants of CDI incidence will allow for more meaningful comparisons of rates and accurate national estimates. METHODS:Data from active population- and laboratory-based CDI surveillance in 7 US states were used to identify CDI cases (ie, residents with positive C difficile stool specimen without a positive test in the prior 8 weeks). Cases were classified as community-associated (CA) if stool was collected as outpatients or ≤3 days of admission and no overnight healthcare facility stay in the past 12 weeks; otherwise, cases were classified as healthcare-associated (HA). Two regression models, one for CA-CDI and another for HA-CDI, were built to evaluate predictors of high CDI incidence. Site-specific incidence was adjusted based on the regression models. RESULTS:Of 10 062 cases identified, 32% were CA. Crude incidence varied by geographic area; CA-CDI ranged from 28.2 to 79.1/100 000 and HA-CDI ranged from 45.7 to 155.9/100 000. Independent predictors of higher CA-CDI incidence were older age, white race, female gender, and nucleic acid amplification test (NAAT) use. For HA-CDI, older age and a greater number of inpatient-days were predictors. After adjusting for relevant predictors, the range of incidence narrowed greatly; CA-CDI rates ranged from 30.7 to 41.3/100 000 and HA-CDI rates ranged from 58.5 to 94.8/100 000. CONCLUSIONS:Differences in CDI incidence across geographic areas can be partially explained by differences in NAAT use, age, race, sex, and inpatient-days. Variation in antimicrobial use may contribute to the remaining differences in incidence.

journal_name

Open Forum Infect Dis

authors

Lessa FC,Mu Y,Winston LG,Dumyati GK,Farley MM,Beldavs ZG,Kast K,Holzbauer SM,Meek JI,Cohen J,McDonald LC,Fridkin SK

doi

10.1093/ofid/ofu048

subject

Has Abstract

pub_date

2014-07-28 00:00:00

pages

ofu048

issue

2

issn

2328-8957

pii

ofu048

journal_volume

1

pub_type

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