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Fecal shedding of zoonotic food-borne pathogens by wild rodents in a major agricultural region of the central California coast.

Abstract：

:Recent outbreaks of food-borne illness associated with the consumption of produce have increased concern over wildlife reservoirs of food-borne pathogens. Wild rodents are ubiquitous, and those living close to agricultural farms may pose a food safety risk should they shed zoonotic microorganisms in their feces near or on agricultural commodities. Fecal samples from wild rodents trapped on 13 agricultural farms (9 produce, 3 cow-calf operations, and 1 beef cattle feedlot) in Monterey and San Benito Counties, CA, were screened to determine the prevalence and risk factors for shedding of several food-borne pathogens. Deer mice (Peromyscus maniculatus) were the most abundant rodent species trapped (72.5%). Cryptosporidium species (26.0%) and Giardia species (24.2%) were the predominant isolates from rodent feces, followed by Salmonella enterica serovars (2.9%) and Escherichia coli O157:H7 (0.2%). Rodent trap success was significantly associated with detection of Salmonella in rodent feces, while farm type was associated with fecal shedding of Cryptosporidium and Giardia. Seasonal shedding patterns were evident, with rodents trapped during the spring and summer months being significantly less likely to be shedding Cryptosporidium oocysts than those trapped during autumn. Higher rodent species diversity tended to correlate with lower fecal microbial prevalence, and most spatiotemporal pathogen clusters involved deer mice. Rodents in the study area posed a minimal risk as environmental reservoirs of E. coli O157:H7, but they may play a role in environmental dissemination of Salmonella and protozoa. Rodent control efforts that potentially reduce biodiversity may increase pathogen shedding, possibly through promotion of intraspecific microbial transmission.

journal_name

Appl Environ Microbiol

journal_title

Applied and environmental microbiology

authors

Kilonzo C,Li X,Vivas EJ,Jay-Russell MT,Fernandez KL,Atwill ER

doi

10.1128/AEM.01503-13

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

6337-44

issue

eissn

0099-2240

issn

1098-5336

pii

AEM.01503-13

journal_volume

pub_type

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Fecal shedding of zoonotic food-borne pathogens by wild rodents in a major agricultural region of the central California coast.