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Volume 14, Number 2—February 2008

Dispatch

Vancomycin-Resistant Enterococci Outbreak, Germany, and Calculation of Outbreak Start

Ulrich Sagel*, Berit Schulte†, Peter Heeg†, and Stefan Borgmann†‡Comments to Author 
Author affiliations: *analyse BioLab GmbH, Linz, Austria; †University of Tübingen, Tübingen, Germany; ‡Synlab Medical Care Centre Weiden, Weiden, Germany;

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Figure 1

Course of vancomycin-resistant enterococci (VRE) outbreak at a German university hospital and time point (arrowhead, 30th calendar week; arrow, 31st calendar week) when outbreak alert could have been given. A) Number of VRE-carrying patients treated in a university hospital in 2004 and 2005. Given is the number of patients who were identified for the first time within a certain month (incident cases). In 2004 the first VRE patient was discovered in April 2005. B) Sum of VRE-exhibiting patients (cumulative number of patients [incident cases]) within distinct calendar weeks in 2004 (black line). Trend line (gray line) indicates exponential increase of numbers of incident cases (y = 0.002, χ2 – 0.3497 × 1.0299 [R2 = 0.9918]).

Figure 1. Course of vancomycin-resistant enterococci (VRE) outbreak at a German university hospital and time point (arrowhead, 30th calendar week; arrow, 31st calendar week) when outbreak alert could have been given. A) Number of VRE-carrying patients treated in a university hospital in 2004 and 2005. Given is the number of patients who were identified for the first time within a certain month (incident cases). In 2004 the first VRE patient was discovered in April 2005. B) Sum of VRE-exhibiting patients (cumulative number of patients [incident cases]) within distinct calendar weeks in 2004 (black line). Trend line (gray line) indicates exponential increase of numbers of incident cases (y = 0.002, χ2 – 0.3497 × 1.0299 [R2 = 0.9918]).

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