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  • Title: Analysis of spatial and temporal clustering of horses with Salmonella krefeld in an intensive care unit of a veterinary hospital.
    Author: Paré J, Carpenter TE, Thurmond MC.
    Journal: J Am Vet Med Assoc; 1996 Aug 01; 209(3):626-8. PubMed ID: 8755983.
    Abstract:
    OBJECTIVE: To determine whether clustering existed in the spatial or temporal distribution of horses that shed Salmonella krefeld in their feces during hospitalization. DESIGN: Retrospective analysis of medical records. ANIMALS: 219 horses housed in the intensive care unit of a veterinary medical teaching hospital from October 1991 through May 1992. PROCEDURE: Bacteriologic culturing of fecal samples was used to identify horses shedding S krefeld. For affected horses, the scan statistic was used to analyze temporal clustering, and Knox's method was used to analyze temporal-spatial clustering. RESULTS: 20 horses were identified as shedding S krefeld in their feces. Significant temporal clustering of affected horses was observed for periods of 5, 6, 7, and 8 days. Temporal-spatial analysis did not detect a significant distribution for any combination of time and distance among affected horses. CLINICAL IMPLICATIONS: Detection of temporal clustering and concurrent random temporal-spatial distribution of affected horses suggested that affected horses were grouped in time, but means of transmission was not related to proximity between horses.
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