Clinical and pathological features of Nigerian equine encephalitis.

The research article discusses a disease in Nigerian horses which has a high mortality rate and is characterized by various symptoms including fever, muscle spasms, and increased heart and respiratory rates. The study suggests that the disease, which ends in terminal lateral recumbency, might be caused by an alphavirus from the equine encephalitis group.

Clinical and Pathological Characteristics

• The main focus of the study is a disease that affects horses in Nigeria, with a significantly high mortality rate although it shows low morbidity, thus not many horses get the disease, but those who do, most likely die from it.
• The primary symptoms observed in the affected horses include a high fever (with a rectal temperature greater than or equal to 40 degrees Celsius), generalized muscle spasms, ataxia (loss of full control of bodily movements), and elevated heart and respiratory rates.
• Another crucial characteristic of the disease is that it causes terminal lateral recumbency, a state in which a horse is lying down and cannot rise, indicating severe physical distress.

Disease Duration

• The illness generally lasts for a span of three to five days.
• However, instances with disease durations as short as 12 to 30 hours have also been reported, indicating the aggressive nature of the disease.

Possible Cause of the Disease

• The researchers have conducted various laboratory investigations to determine the root cause of the disease.
• These investigations include tests for detecting pathological changes in body tissues (histopathology) and the study of blood serum (serology).
• The preliminary findings based on these investigations hint toward a viral origin, suggesting that the disease could be caused by an alphavirus.
• Further, the researchers posit that this virus could belong to the equine encephalitis group, a group of viruses known to cause inflammation of the brain in horses and other equines.