Use of an in vitro culture system to detect Theileria equi strains from infected equids and/or reservoirs.

This research article focuses on the use of a modified in vitro culture system to identify Theileria equi strains in horses and mules based on their case history and lab test results.

Overview of the Research

• The research involved using a horse erythrocyte culture technique, which was a modification of a system initially developed by a scientist named Holman. This system was used to identify whether Theileria equi, a protozoan organism causing diseases in horses, was present in infected blood samples.
• The samples tested came from 12 horse and 2 mule blood samples. The animals were categorized into groups according to their case history and laboratory test results.
• The animals were divided into four categories. One group had horses and mules with recent infections. Another group consisted of horses with a history of past infections. The third group was composed of animals that had received treatments against Theileria. The last group had horses with an unknown infection history.

Results and Findings

• Ten strains of Theileria equi were isolated using this technique. Out of the ten, nine were found in horse samples while the remaining was from the mule blood sample. This marked the first time a Theileria equi strain was isolated from a mule using horse erythrocyte culture.
• After isolation, all strains from horses demonstrated growth and adaptation in vitro, meaning that growth occurred in an artificial environment (a lab dish or test tube) as opposed to inside a living organism. The parasitaemia -or the extent of parasites in the blood- reached a peak of more than 10%.
• If the cultures were frozen and then grown again under the same conditions, the adapted strains showed growth after lying dormant for eight days. This demonstrates the viability of the strains even after freezing and recommencing the culture process.
• The method used in this research has proven effective for culturing and replicating Theileria equi strains from horses and mules, thereby providing a useful tool for further research into these pathogens.
• Interestingly, this in vitro technique also identified carriers of the infection that were undetectable via other testing methods including microscopic examination, indirect immunofluorescence, and complement fixation techniques.