Comparison of Salmonella enterica serovar distribution and antibiotic resistance patterns in wastewater at municipal water treatment plants in two California cities

doi:10.1111/j.1365-2672.2006.03031.x

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Wiley InterScience

Journal of Applied Microbiology

Volume 101 Issue 6, Pages 1309 - 1316

Published Online: 17 Jul 2006

The Official Journals of the Society for Applied Microbiology

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ORIGINAL ARTICLE

Comparison of Salmonella enterica serovar distribution and antibiotic resistance patterns in wastewater at municipal water treatment plants in two California cities

A.C.B. Berge ¹ , E.L. Dueger ² and W.M. Sischo ³

1 Veterinary Medicine Teaching and Research Center, University of California, Davis, CA, USA
2 Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, CA, USA
3 Department of Population, Health and Reproduction, University of California, Davis, CA, USA

Correspondence to Anna Catharina Björnsdotter Berge, Veterinary Medicine Teaching and Research Center, University of California, Davis, 18830, Road 112, Tulare, CA 93274, USA. E-mail: caberge@ucdavis.edu

Present address
Erica L. Dueger, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA

KEYWORDS

antibiotic resistance patterns • municipal wastewater • Salmonella enterica

Abstract

Aim: To determine Salmonella enterica serovars and antibiotic resistance (ABR) in the human waste stream.

Methods and Results: Sampling of influent wastewater at municipal treatment plants in two California cities was performed by collecting composite samples, over a 24-h period, from the treatment plants on five to six occasions. Serial water quantities were filtered and cultured with a Salmonella selective method and an oxytetracycline-supplemented Salmonella selective method. Antibiotic susceptibilities to 12 antibiotics were determined and the isolates were grouped based on ABR patterns. From 983 S. enterica isolated, 102 represented unique sampling-serovar-ABR patterns. Thirty-five different serovars were identified to be distributed over 17 different ABR patterns. The serovar distribution differed between the sampling sites, whereas there was no significant trend in levels of multiple ABR.

Conclusions: Salmonella enterica was recovered with ease from small sample volumes of wastewater received by municipal water treatment plants. A large variety of serovars and ABR profiles were represented in the recovered Salmonella.

Significance and Impact of the Study: The ease of sampling and recovery of Salmonella from municipal wastewater from treatment plants makes it a valuable sampling approach for monitoring the presence of Salmonella in the human population.

2005/1321: received 4 November 2005, revised 21 February 2006 and accepted 21 March 2006

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1365-2672.2006.03031.x About DOI