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The centrality of milk and dairy products to the human diet allows potential pathogens to pose a threat to human health. Pathogenic  Escherichia coli  is a zoonotic foodborne pathogen with many virulence genes which cause variations in its pathogenicity. The current study aimed to investigate the pathogenic potential of  E. coli  from milk of dairy cows with subclinical mastitis and evaluate the genetic relatedness to  E. coli  from human sources. The majority of the  E. coli  isolates belonged to the A (55.0%) and B2 (22.5%) phylogenetic groups and the most prevalent virulence genes were  colV  (90.0%),  fyuA  (75.0%) and  vat  (42.5%). Mice injected with G4-BD23 ( P  &lt; 0.05) and G5-BD3 had lower survival rates than controls and visible pathological changes to lung and kidney. Nineteen MLST types were identified in 40 dairy  E. coli  isolates and three STs (ST10, ST48 and ST942) were shared with those from human sources. Some dairy  E. coli  isolates were phylogenetically related to human  E. coli  isolates indicating pathogenic potential.

The pathogenic potential and genetic attributes of Escherichia coli in milk from dairy cows with subclinical mastitis