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Lett Appl Microbiol. 2019 Apr 1. doi: 10.1111/lam.13156. [Epub ahead of print]

Prevalence of Escherichia coli O157 and Salmonella spp. in solid bovine manure in California using real-time quantitative PCR.

Author information

1
Deparment of Population Health and Reproduction, School of Veterinary Medicine, Davis, CA, USA.
2
Western Center for Food Safety, University of California, Davis, CA, USA.
3
University of California Cooperative Extensions, Eureka, CA, USA.

Abstract

The occurrence of Escherichia coli O157 and Salmonella spp. in solid bovine manure was investigated through a multi-county survey in California. Solid bovine manure samples (n = 91) were collected from 13 dairy farms located in multiple counties in California between June 2016 and August 2017. To quantify pathogens, DNA was extracted from bacteria in manure samples. Afterwards, the prevalence and levels of E. coli O157 and Salmonella spp. in solid bovine manure were determined by real-time quantitative PCR (qPCR). The prevalence of E. coli O157 and Salmonella spp. in solid bovine manure was 15·4 and 6·6% respectively. Escherichia coli O157 and Salmonella spp. levels in positive samples ranged from 3·1 to 5·3 log CFU per g and from positive (the population was <3 log CFU per g) to 5·2 log CFU per g respectively. Surface samples of manure piles had higher prevalence and levels of E. coli O157 and Salmonella spp. than subsurface samples, while no seasonal effects on pathogen occurrence were observed. Our results indicated that solid bovine manure is a source of E. coli O157 and Salmonella spp. and the application of untreated manure as biological soil amendments may pose potential risks to public health.

KEYWORDS:

qPCR ; Escherichia coli O157; Salmonella spp.; biological soil amendments; pathogen; solid bovine manure

PMID:
30932223
DOI:
10.1111/lam.13156

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