Effect of detecting and isolating clostridium difficile carriers at hospital admission on the incidence of C difficile infections A quasi-experimental controlled study

Yves Longtin*, Bianka Paquet-Bolduc, Rodica Gilca, Christophe Garenc, Elise Fortin, Jean Longtin, Sylvie Trottier, Philippe Gervais, Jean Francois Roussy, Simon Levesque, Debby Ben-David, Isabelle Cloutier, Vivian G. Loo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


IMPORTANCE Clostridium difficile infection (CDI) is a major cause of health care-associated infection worldwide, and new preventive strategies are urgently needed. Current control measures do not target asymptomatic carriers, despite evidence that they can contaminate the hospital environment and health care workers' hands and potentially transmit C difficile to other patients. OBJECTIVE To investigate the effect of detecting and isolating C difficile asymptomatic carriers at hospital admission on the incidence of health care-associated CDI (HA-CDI). DESIGN, SETTING, AND PARTICIPANTS We performed a controlled quasi-experimental study between November 19, 2013, and March 7, 2015, in a Canadian acute care facility. Admission screening was conducted by detecting the tcdB gene by polymerase chain reaction on a rectal swab. Carriers were placed under contact isolation precautions during their hospitalization. MAIN OUTCOMES AND MEASURES Changes in HA-CDI incidence level and trend during the intervention period (17 periods of 4 weeks each) were compared with the preintervention control period (120 periods of 4 weeks each) by segmented regression analysis and autoregressive integrated moving average (ARIMA) modeling. Concomitant changes in the aggregated HA-CDI incidence at other institutions in Quebec City, Quebec (n = 6) and the province of Quebec (n = 94) were also examined. RESULTS Overall, 7599 of 8218 (92.5%) eligible patients were screened, among whom 368 (4.8%) were identified as C difficile carriers. During the intervention, 38 patients (3.0 per 10 000 patient-days) developed an HA-CDI compared with 416 patients (6.9 per 10 000 patient-days) during the preintervention control period (P < .001). There was no immediate change in the level of HA-CDIs on implementation (P = .92), but there was a significant decrease in trend over time of 7%per 4-week period (rate ratio, 0.93; 95%CI, 0.87-0.99 per period; P = .02). ARIMA modeling also detected a significant effect of the intervention, represented by a gradual progressive decrease in the HA-CDI time series by an overall magnitude of 7.2 HA-CDIs per 10 000 patient-days.We estimated that the intervention had prevented 63 of the 101 (62.4%) expected cases. By contrast, no significant decrease in HA-CDI rates occurred in the control groups. CONCLUSIONS AND RELEVANCE Detecting and isolating C difficile carriers was associated with a significant decrease in the incidence of HA-CDI. If confirmed in subsequent studies, this strategy could help prevent HA-CDI.

Original languageEnglish
Pages (from-to)796-804
Number of pages9
JournalJAMA Internal Medicine
Issue number6
StatePublished - Jun 2016
Externally publishedYes


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