Characterisation of the cerebrospinal fluid of horses with West Nile virus neuroinvasive disease.

The research explores the change in cerebrospinal fluid (CSF) composition in horses affected by the West Nile Virus (WNV) neuroinvasive disease, comparing it to healthy controls. The researchers found that abnormal levels of certain proteins, enzymes, ions, glucose, and lactate were observed in WNV affected horses. Significantly, elevated glucose levels were associated with poor survival outcomes. However, the exact link between the observed changes and the central nervous system disorder caused by the virus, remains unclear.

Objective, sample and methodology of the research

• The primary goal of this study is to compare and understanding the changes that occur in the CSF of horses severely infected by West Nile Virus (WNV) with healthy controls.
• To ensure a comprehensive comparison, CSF samples from thirteen horses with WNV acute encephalomyelitis were gathered, while a control group comprised of twenty healthy horses was used.
• The researchers evaluated the samples for the presence of a number of constituents including proteins, specific enzymes, ions, glucose and lactate.
• The study further analyzed the presence and type of pleocytosis, an inflammation condition indicated by elevated white blood cell count in CSF.

Main Findings

• The study observed abnormal levels of proteins, certain enzymes, ions, glucose and lactate in the CSF of horses with WNV acute encephalomyelitis compared with the control group.
• Notably, six out of the thirteen horses with elevated glucose levels did not survive. This suggests a potential correlation between high CSF glucose level and poor survival outcome in horses with WNV infection.
• More neutrophils than mononuclear cells were found during pleocytosis with WNV infection, which suggests their role in inflammatory response and brain damage.
• It’s crucial to note that while the glucose levels could predict the outcome, they could also be a result of increased plasma levels that reflect general stress, posing uncertainty whether this change directly relates to central nervous system pathophysiology.

Significance of the Research

• This research adds to the understanding of the major changes in CSF composition which occur when a horse is inflicted with WNV encephalomyelitis. This is crucial in understanding the nature of the damage and possible treatment options.
• The discovery of significantly increased glucose levels in CSF of infected horses might serve as a marker for treatment outcomes which could be useful in predicting patient survival.
• The variable and non-specific changes in the CSF of horses infected with WNV might help with differential diagnosis process.