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Bacteriophages specific to Shiga toxin-producing Escherichia coli exist in goat feces and associated environments on an organic produce farm in Northern California, USA
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Bacteriophages specific to Shiga toxin-producing Escherichia coli exist in goat feces and associated environments on an organic produce farm in Northern California, USA
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Journal Article
Bacteriophages specific to Shiga toxin-producing Escherichia coli exist in goat feces and associated environments on an organic produce farm in Northern California, USA
2020
Overview
Shiga toxin-producing Escherichia coli (STECs) contamination of produce, as a result of contact with ruminant fecal material, has been associated with serious foodborne illness. Bacteriophages (phages) that infect STECs have primarily been reported to be of cattle origin. However, they likely exist in other environments or in animals that share habitats with cattle, such as goats. To explore the presence and diversity of phages specific to STEC O157 and the top six non-O157 STECs in goat-associated environments, environmental samples consisting of feces (goat and cattle) and soil samples were collected monthly for six months from an organic produce farm. A variety of phages belonging to the Myoviridae, Siphoviridae, and Podoviridae families were isolated from all goat fecal and half of the soil samples. The most commonly isolated phages belonged to Myoviridae and were lytic against STEC O103. The isolated phages had different host ranges, but collectively, showed lytic activity against O157 and the top six non-O157 STEC strains excluding O121. Two non-O157 STECs (O174: H21 and O-antigen-negative: H18) were isolated from soil and cattle feces, respectively. Although prior studies have reported that goats shed STEC into the environment, the findings of the current study suggest that goat feces may also contain lytic STEC-specific phages. The phages of goat origin have the capacity to infect STECs implicated in causing foodborne outbreaks, making them potential candidates for biocontrol pending additional characterization steps. Further work is needed to determine if the addition of goats to the farm environment could potentially reduce the presence of STECs.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Antigens
/ Bacteria
/ Bacteriophages - isolation & purification
/ Cattle
/ DNA, Viral - isolation & purification
/ E coli
/ Escherichia coli Infections - microbiology
/ Escherichia coli Infections - prevention & control
/ Farms
/ Feces
/ Food, Organic - microbiology
/ Foodborne Diseases - microbiology
/ Foodborne Diseases - prevention & control
/ genes
/ Goats
/ Manures
/ Phages
/ Research and Analysis Methods
/ Shiga toxin-producing Escherichia coli
/ Shiga-Toxigenic Escherichia coli - virology
/ soil
/ Soils
/ Testing
/ Toxins
