Isolation of Actinobacillus equuli from the oral cavity of healthy horses and comparison of isolates by restriction enzyme digestion and pulsed-field gel electrophoresis.

This research investigated the occurrence of Actinobacillus equuli bacteria in the mouths of healthy horses and analyzed the variability of these bacteria using restriction enzyme digestion and pulsed-field gel electrophoresis.

Study Methodology

• The research involved the collection of swab samples from the mouths of 174 horses from 10 different farms.
• These samples were then cultured in a manner that encourages the growth of Actinobacillus equuli bacteria.
• From these cultures, researchers were able to identify A. equuli in 37% of all samples, although the frequency of finding these bacteria in samples varied widely between different farms, ranging from 12% to 88%.

Detailed Analysis

• Eight horses were sampled multiple times over several days, showing an isolation frequency (i.e., the rate at which instances of A. equuli were found) between 50% and 88%.
• In the analysis phase, isolates of A. equuli were compared using two techniques: restriction enzyme digestion and Pulsed-Field Gel Electrophoresis.
• Both techniques are used in genetic research to cut DNA into pieces and separate these pieces based on their size, allowing researchers to compare genetic sequences and identify differences between them. These procedures were used to give a detailed understanding of the strains of A. equuli found in the horse populations.

Findings and Conclusion

• The research found a high degree of variability in the strains of A. equuli across the different horse populations studied.
• Additionally, they observed some variability over time in the strains found within individual horses.
• This suggests that the bacterial population within a horse’s mouth may change over time and is subject to influence from factors related to its environment, such as the specific location of the farm.