Ann Lab Med.  2015 Jan;35(1):82-88. 10.3343/alm.2015.35.1.82.

Evaluation of the Impact of Automated Specimen Inoculation, Using Previ Isola, on the Quality of and Technical Time for Stool Cultures

Affiliations
  • 1Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany. stefan.zimmermann@med.uni-heidelberg.de

Abstract

BACKGROUND
This study was designed as a quasi-experiment to evaluate automatic inoculation of fecal specimens, using the automated specimen inoculator Previ Isola (bioMerieux, France).
METHODS
We evaluated the quality of cultures, recovery rates of enteropathogenic bacteria (Salmonella, Shigella, Campylobacter, and Yersinia species), and cost-effectiveness in terms of technical time. The Previ Isola recovery rates for the two-year period from August 2009 to July 2011 were compared with historical manual inoculation data of the previous two years (August 2007 to July 2009). The regional (Baden-Wurttemberg) and nationwide (Germany) trends of recovery rates for this four-year period were referred.
RESULTS
A total of 5,884 fecal specimens were collected over the study period. Most positive cultures were for Salmonella, followed by Campylobacter. Compared with the historical data, the numbers of Campylobacter-positive specimens for a year between August and July were increased significantly, from 19 in 2007-2008 and 10 in 2008-2009 to 32 in 2009-2010 (P=0.002) and 32 in 2010-2011 (P=0.003), respectively. During the study period, the official data for our region and nationwide did not show this increase in the recovery rate of Campylobacter. For Salmonella, Shigella, and Yersinia, no significant changes were observed. Compared with manual inoculation, the mean hands-on time with Previ Isola inoculation was significantly shortened, from 37:30 min to 8:42 min per 15 fecal specimens.
CONCLUSIONS
Inoculation by Previ Isola improves the quality of routine culture of fecal specimens, with better sensitivity for Campylobacter and less hands-on time.

Keyword

Previ Isola; Fecal specimen; Automation; Inoculation

MeSH Terms

Automation
Bacteria/*isolation & purification
Bacteriological Techniques/*methods/standards
Campylobacter/isolation & purification
Feces/*microbiology
Humans
Quality Control
Salmonella/isolation & purification
Shigella/isolation & purification
Yersinia/isolation & purification

Figure

  • Fig. 1 Colony growth on Campylobacter agar streaked manually (left) and on corresponding agar plates streaked by the Previ Isola system (right).

  • Fig. 2 Trends of reported cases of Salmonella, Shigella, Yersinia, and Campylobacter over four years, from the official data for Germany and for the Baden-Württemberg region. Number of cases for the pathogens indicated in the given time period are shown for Germany (A) and Baden-Württemberg (B). Source: Robert Koch Institut; http://www3.rki.de/SurvStat.


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