Equine babesiosis associated with strenuous exercise: clinical and pathological studies in Jordan.

The research conducted in Jordan looks at the effects of Babesia equi, a parasite, on a group of 103 racehorses. The study was specifically interested in what happens to these horses after strenuous activity. It was discovered that a significant subset faced health problems such as fever, icterus and anorexia due to heavy parasitism, and some were even on the brink of death. The researchers concluded that the diseased horses were suffering from haemolytic anaemia, which responded well to therapy with a drug called imidocarb.

Methodology and Participants

• A total of 103 racing horses were included in this study. These were divided into three groups based on their health and parasitic state.
• Group 1 comprised five horses that showed signs of babesiosis, such as immobility and reluctance to move. Two of the horses in this group also had haemoglobinuria, and all were heavily parasitized with B. equi.
• Group 2 consisted of four horses that were also parasitized but showed no evidence of clinical babesiosis.
• Group 3 covered the remainder of the horses, 94 in total, which were seemingly healthy and weren’t infested with the parasite.

Results: Clinical and Hematological Analysis

• Horses in group 1 and 2 responded well to treatment with imidocarb, a drug used to treat babesiosis.
• A comparative assessment of the mean values of various blood-related parameters (like white blood cell count, red blood cell count, haemoglobin and packed cell volume) between the groups showed significant differences, primarily in the first group of horses.
• This group also showed a considerable decrease in total serum protein and an increase in bilirubin, when compared to the other groups.
• In addition, there was a significant elevation in the levels of certain enzymes like aspartate aminotransaminase, gamma-glutamyltransferase and creatine phosphokinase, and a substantial rise in alkaline phosphatase.

Results: Post-mortem and Histopathological Analysis

• The dead horses from group 1 presented symptoms like icterus and hepatomegaly, and their urinary bladder contained deep-red urine.
• On microscopic examination, it was noted that the horses had massive centrilobular degeneration and necrosis along with bile ducts plugged with bile pigments.
• Further examination of the lungs revealed congestion, oedema, and thrombosis of pulmonary veins.

Conclusion

• Based on the clinical, hematological, and pathological results, the study concluded that the horses were suffering from B. equi, with visible symptoms following exercise.
• The findings also indicate that the animals were struggling with a condition called haemolytic anaemia, which responded effectively to imidocarb treatment.