Comparing Antibiotic Resistance in Organic and Conventional Milk
Author Information
Author(s): Bartoszewicz Marek, Czyżewska Urszula, Zambrzycka Monika, Święcicka Izabela
Primary Institution: University of Białystok
Hypothesis
Organic animal husbandry and minimizing antibiotic use should lead to a lower prevalence of resistant strains of Bacillus cereus.
Conclusion
Organic milk contains more Bacillus cereus but fewer antibiotic-resistant strains compared to conventional milk.
Supporting Evidence
- Conventional milk had on average 3 times fewer Bacillus cereus s.l. isolates than organic milk.
- 21% of Bacillus cereus s.l. isolates were multidrug-resistant.
- 42% of isolates were non-susceptible to two classes of antibiotics.
- Isolates from conventional milk exhibited higher MICs for several antibiotics compared to those from organic milk.
Takeaway
This study looked at bacteria in milk from organic and regular farms. It found that while organic milk had more bacteria, those bacteria were less likely to be resistant to antibiotics.
Methodology
The study used membrane ultrafiltration to isolate Bacillus cereus s.l. from milk samples and assessed antibiotic resistance using disk diffusion and MIC methods.
Potential Biases
Potential bias may arise from the selection of farms and the methods used for bacterial isolation.
Limitations
The study was limited to milk samples from a specific region and may not represent all dairy farms.
Participant Demographics
Milk samples were collected from four dairy farms: two organic and two conventional.
Statistical Information
P-Value
0.032
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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