Study of Udder Pathogens in Dairy Cows with Mastitis in Sweden
Author Information
Author(s): Ylva Persson, Ann-Kristin Nyman, Ulrika Grönlund-Andersson
Primary Institution: National Veterinary Institute, Sweden
Hypothesis
What is the microbial etiology and antimicrobial resistance of udder pathogens in dairy cows with subclinical mastitis?
Conclusion
Staphylococcus aureus and coagulase-negative staphylococci were the most frequently isolated pathogens, and resistance to antimicrobials was rare.
Supporting Evidence
- The most common isolates were Staphylococcus aureus (19%) and coagulase-negative staphylococci (16%).
- Resistance to penicillin G was found in 4% of S. aureus and 35% of CNS isolates.
- Overall resistance to other antimicrobials was uncommon.
Takeaway
This study looked at sick cows to find out what germs were making them sick and if those germs could resist medicine. They found that most germs were not resistant to the medicine.
Methodology
The study collected 583 quarter milk samples from 583 dairy cows across 226 farms and analyzed them for bacterial presence and antimicrobial resistance.
Potential Biases
Potential bias from sampling only during specific months and reliance on veterinarians for sample collection.
Limitations
The study may not capture all cases of subclinical mastitis due to the single sampling method.
Participant Demographics
Cows were primarily Swedish Holstein (53%) and Swedish Red (42%), with a range of parity from 1 to 9.
Statistical Information
P-Value
p<0.001
Confidence Interval
(1.17; 3.52)
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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