Bacteraemia in neonatal foals: clinicopathological differences between Gram-positive and Gram-negative infections, and single organism and mixed infections.

The research article focuses on studying the clinicopathological differences between various types of bacterial infections in foals. The goal here is to gather information that can aid in the early selection of effective antimicrobials before the complete identification of the bacterium causing the infection.

Objective and Methods

The main objective of the study was to describe the variability in clinical and clinicopathological data in cases of foals suffering from bacteraemia caused by different groups of bacteria.

• In order to reach the desired outcomes, the researchers examined records of foals that were less than 10 days old, admitted to a university hospital between 1995 and 2004, and had been tested positive for a blood culture.
• The cultural results of the bacteria, the subject details, historical data, findings of the physical examination at admission, and the clinicopathological data registered during the initial 48 hours of hospitalisation were evaluated to get a comprehensive understanding.

Research Findings

• The subject pool for this study consisted of 85 foals that met the specified criteria. The researchers found distinct differences in the clinicopathological characteristics based on the type of bacteria predominantly present.
• Among these, 59 foals had Gram-negative organisms, 13 had Gram-positive organisms, and 19 had multiple organisms present in their blood stream.
• Foals having a Gram-negative bacteraemia had a lesser total white blood cell and lymphocyte count at the time of admission as opposed to those with only Gram-positive bacteria present.
• Mixed organism bacteraemia in foals was characterized by tachycardia, high sodium, chloride and urea nitrogen serum concentrations, acidosis, respiratory distress, recumbency on admission and higher fatality rates.
• Specifically, infections caused by Actinobacillus spp. were associated with leukopenia, neutropenia, lymphopenia, and instances of depression at the time of admission.

Conclusion

The study provides that recognizing the distinct patterns of clinical and clinicopathological findings that are associated with different groups of bacteria can assist in making better decisions for early antimicrobial selection. This would ultimately lead to a better prognosis in bacteraemic foals in the future.