Study suggests Vero cells could expand FIP coronavirus research
CURRENT BRIEF VERSION: Researchers at Murdoch University and collaborators reported that they successfully propagated feline coronavirus from three clinically diagnosed effusive feline infectious peritonitis cases in Vero cells, a widely used non-feline cell line, and documented characteristic cytopathic effects plus falling RT-qPCR Ct values across passages that supported active viral replication. The paper, published February 25, 2026, in Veterinary Record Open, positions Vero culture as a potentially more accessible in vitro platform for studying field strains linked to FIP, rather than relying only on less available feline-specific cell lines. The three cats were identified in Perth, Western Australia, between July and September 2024. (pmc.ncbi.nlm.nih.gov)
Why it matters: For veterinary professionals, the significance is less about immediate clinical practice and more about research infrastructure. FCoV, especially type I strains, has historically been difficult to grow in vitro, which has slowed work on pathogenesis, antiviral resistance, sequencing, and vaccine development. The authors argue that a workable Vero-cell model could help lower that barrier, especially in resource-limited labs. That comes as FIP research is accelerating globally, with updated ABCD and ISFM guidance noting both the rarity of direct cat-to-cat transmission in typical FIP cases and the unusual Cyprus outbreak context, where a proposed highly virulent strain has been linked to rapid spread, indoor-cat involvement, and concern about international movement of cats; legal antiviral options such as remdesivir and GS-441524 are now available there, though cost remains a constraint. Separately, UC Davis researchers recently reported that naturally occurring FIP infects a broader range of immune cells than previously thought, including B and T lymphocytes in lymph nodes, with evidence of active replication and possible viral persistence after antiviral treatment—findings that strengthen interest in FIP as a model for broader coronavirus immunobiology and post-viral disease. (pmc.ncbi.nlm.nih.gov)
What to watch: Whether follow-up studies confirm which FCoV genotype was propagated, reproduce the model in larger cohorts and other cell lines, and translate the system into practical antiviral screening, sequencing, or vaccine-development workflows. It will also be worth watching whether more accessible culture systems help researchers investigate unusual outbreak-associated strains such as those implicated in Cyprus. (pmc.ncbi.nlm.nih.gov)