Use of an insect cell culture growth medium to isolate bacteria from horses with effusive, fibrinous pericarditis: a preliminary study.

This research article explores how an insect cell culture growth medium (ICCGM) was used to successfully isolate bacteria from horses experiencing a rare condition known as effusive, fibrinous pericarditis. Traditional methods using blood agar plates failed to yield any bacterial growth, confirming that ICCGM might potentially enhance bacterial isolation from equine pericardial fluid.

Objective of the Research

• The main intent of this research was to investigate a novel approach of isolating bacteria from horses diagnosed with a rare heart disease known as effusive, fibrinous pericarditis. In 2001, an epizootic event in Kentucky associated with eastern tent caterpillars was believed to cause pericarditis. The study focused on isolating the bacteria using an insect cell culture growth medium (ICCGM), which was presumed to be more effective than traditional methods.

Research Methodology

• The researchers used previously cultured, frozen samples from four horses with fibrinous pericarditis.
• The samples were initially tried on 10% blood agar plates, which is a standard method for bacterial isolation. However, this method yielded no growth.
• The same samples were then inoculated using ICCGM, which was successful in isolating several types of bacteria.

Key Findings

• The use of ICCGM resulted in the successful isolation of four types of bacteria: Proprionibacterium acnes, Staphylococcus equorum, a Streptococcus species, and Pseudomonas rhodesiae. These bacteria were found in the pericardial fluid samples.
• No bacteria associated with eastern tent caterpillars was identified, which fact credit to a disagreement with the initial hypothesis.

Conclusion

• While the study was unable to isolate bacteria associated with eastern tent caterpillars (believed to be the cause of pericarditis), it successfully isolated other bacteria using ICCGM.
• The research concludes that ICCGM may potentially enhance the isolation of bacteria from equine pericardial fluid, promoting its use in future studies, despite being a preliminary investigation.