Horse Meat Microbiota: Determination of Biofilm Formation and Antibiotic Resistance of Isolated Staphylococcus Spp.

Overview

• This study analyzed the bacterial communities present in horse meat from Kazakhstan and Kyrgyzstan, focusing on identifying Staphylococcus species and their potential for biofilm formation and antibiotic resistance.
• The research aimed to assess the microbiota composition and evaluate possible health risks associated with consuming horse meat, especially related to antibiotic-resistant bacteria.

Introduction and Context

• Horses are bred not only for leisure activities but also for meat production in several countries.
• Horse meat consumption is common in countries like Kazakhstan and Kyrgyzstan.
• The Food and Agricultural Organization has registered horses as livestock with the growing interest in horse meat consumption.
• Studying the microorganisms on horse meat is important to ensure consumer safety and understand potential public health risks.

Study Design and Sample Collection

• A total of 56 horse meat samples were collected; 32 from Kazakhstan and 24 from Kyrgyzstan.
• These samples were sourced from three locations in Kazakhstan and one in Kyrgyzstan to represent regional variations.
• The study used advanced molecular techniques, including next-generation sequencing and metabarcoding, to analyze bacterial populations.

Microbiota Composition Findings

• The dominant bacterial groups identified in all horse meat samples were from three major phyla:
  • Firmicutes
  • Proteobacteria
  • Actinobacteria
• This microbiota profile aligns with common bacterial communities found in meat and other animal products.

Isolation and Identification of Staphylococcus Strains

• Three Staphylococcus strains (representing 5.4% of samples) were isolated from the Uzynagash region of Kazakhstan.
• Identification was performed using partial 16S rRNA gene sequencing (via Sanger sequencing).
• The isolated strains were identified as:
  • Staphylococcus aureus
  • Staphylococcus epidermidis
  • Staphylococcus haemolyticus

Biofilm Formation and Antibiotic Resistance

• All three isolated Staphylococcus strains were found to be non-biofilm formers, which implies they might not strongly adhere or persist on surfaces like meat packaging or processing equipment.
• One isolate, Staphylococcus aureus, was multidrug-resistant, showing resistance to:
  • Penicillin
  • Cefoxitin
  • Oxacillin
• This multidrug-resistant S. aureus poses a potential health risk if meat is undercooked or handled improperly.
• The study also detected the presence of specific genes (A, C, and K), although the abstract does not specify their exact role; these may be related to antibiotic resistance or virulence.

Significance and Public Health Implications

• This is the first study detecting potentially pathogenic and antibiotic-resistant Staphylococcus species in horse meat from Kazakhstan.
• Consumers could be at risk of exposure to antibiotic-resistant pathogens if horse meat is consumed undercooked.
• The study highlights the importance of monitoring and regulating microbial contamination in horse meat to prevent foodborne illnesses.
• These findings emphasize the need for strict hygiene and proper cooking practices to reduce bacterial contamination risks.

Conclusion

• Horse meat samples contain a range of bacteria, including some potentially pathogenic Staphylococcus strains.
• Though biofilm formation was not detected in isolated Staphylococcus strains, the presence of multidrug-resistant bacteria is a significant concern.
• The study underscores the potential health risks tied to consumption of undercooked horse meat and the necessity for continued surveillance of antibiotic-resistant bacteria in meat products.