Characterization of Escherichia coli Strains Derived from Cow Milk of Subclinical and Clinical Cases of Mastitis
Katarzyna Grudlewska-Buda , Krzysztof Skowron , Ewa Wałecka-Zacharska , Natalia Wiktorczyk-Kapischk , Jarosław Bystroń , Agnieszka Kaczmarek , Eugenia Gospodarek-Komkowska
AbstractMastitis is a major economic problem in dairy herds, as it might decrease fertility, and negatively affect milk quality and milk yield. Out of over 150 bacterial species responsible for the udder inflammation, Escherichia coli is one of the most notable. This study aimed to assess antimicrobial susceptibility, resistance to dipping agents and biofilm formation of 150 E. coli strains isolated from milk of cows with subclinical and clinical mastitis. The strains came from three dairy herds located in Northern and Central Poland. The statistical analyses were performed with post-hoc Bonferroni test and chi-square test (including Yates correction). The data with a p value of <0.05 were considered significant. We found that the tested strains were mostly sensitive to antimicrobials and dipping agents. It was shown that 37.33% and 4.67% of strains were resistant and moderately resistant to at least one antimicrobial agent, respectively. No extended-spectrum beta-lactamases (ESBL)-producing E. coli were detected. The majority of strains did not possess the ability to form biofilm or formed a weak biofilm. The strong biofilm formers were found only among strains derived from cows with subclinical mastitis. The lowest bacteria number was noted for subclinical mastitis cows’ strains, after stabilization with iodine (3.77 log CFU × cm−2) and chlorhexidine (3.96 log CFU × cm−2) treatment. In the present study, no statistically significant differences in susceptibility to antibiotics and the ability to form biofilm were found among the strains isolated from cows with subclinical and clinical mastitis. Despite this, infections in dairy herds should be monitored. Limiting the spread of bacteria and characterizing the most common etiological factors would allow proper treatment.
|Journal series||Applied Sciences-Basel, [Applied Sciences (Switzerland)], ISSN 2076-3417, (N/A 70 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Escherichia coli; mastitis; milk cow; dairy cow; antimicrobial susceptibility; biofilm formation|
|ASJC Classification||; ; ; ; ;|
|License||Journal (articles only); published final; ; with publication|
|Score||= 70.0, 10-05-2021, ArticleFromJournal|
|Publication indicators||= 0; = 0; : 2018 = 0.985; : 2018 = 2.217 (2) - 2018=2.287 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.