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Cell lines originating from horses are necessary for isolation and propagation of equine herpesviruses (EHV). Although we established an equine-derived cell line, FHK-Tcl3, propagation ceased after fewer than 40 passages. In this study, FHK-Tcl3 cell propagation continued beyond 40 passages, achieving over 100 passages. FHK-Tcl3 cells were then cloned by limiting dilution at the 100th passage. Cloned cells were termed FHK-Tcl3.1. FHK-Tcl3.1 cells grew well and were propagated every 3 to 4 days by splitting 1:5. In addition, EHV-1, -2 and -4 showed a clear cytopathic effect (CPE) in FHK-Tcl3.1 cells, and this CPE was very similar to those seen in parental FHK-Tcl3 and primary fetal horse kidney cells. FHK-Tcl3.1 cells continue to propagate and the current passage record is over 100 times after cloning. Therefore, this cell appears to have been immortalized. FHK-Tcl3.1 cells have potential for growth and diagnosis of various equine viruses, including equine herpesviruses.

Further Development of an Equine Cell Line that can be Propagated over 100 Times