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Table 2 Summary of metadata for farm and best BLAST hit NCBI plasmids with high similarity (≥ 95% identity and ≥ 90% alignment coverage) to a clinical plasmid. Only NCBI plasmids from environmental sources were included. The asterisk for the IncFII(S) plasmid indicates an exception where the pMLST genes were identical between the clinical and farm plasmids, but the percentage of shared gene cargo was less than 40%. Here, phylogenetic neighborhood refers to all NCBI Pathogen Detection isolates within 1000 core gene alleles of the clinical clade

From: Assessment of plasmids for relating the 2020 Salmonella enterica serovar Newport onion outbreak to farms implicated by the outbreak investigation

Plasmid type

Number of isolates with plasmid (clinical, Holtville, Bakersfield)

Number of highly similar plasmids (clinical, Holtville, Bakersfield)

Number of best hits in NCBI Pathogen and Nucleotide databases

Geographic extent of NCBI best hits

Environmental isolation sources of NCBI best hits

Temporal range of NCBI best hits

Bacterial host range (genera) of NCBI best hits

IncFII(S)*

1728

3

7

1728

3*

7*

30

United States, Mexico

River water, soil, almonds, pistachios, chicken

2010 to 2020

Salmonella

IncI1-I(Gamma)

27

13

3

10

1

1

50

United States, South Korea, Canada, United Kingdom, Denmark, Switzerland

Cow, sheep, dog, pig, chicken, catfish, horse, iguana, lettuce, soil

2002 to 2022

Escherichia, Salmonella, Shigella

ColpVC

12

3

0

1

4

0

100

United States, Canada

Chicken, turkey, pig

2007 to 2020

Salmonella

Col440I

3

60

8

1

4

2

19

United States, Germany, Mexico, Venezuela, Ecuador

Chicken, cow, pig, papaya, river water

2013 to 2020

Escherichia, Salmonella

Unclassified

373

235

42

2

5

0

12

United States, Australia, United Kingdom, India, Japan

Dog, cow, pig, chicken, wastewater

2014 to 2021

Escherichia, Salmonella, Klebsiella