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Peer-reviewed veterinary case report

New type I feline coronavirus vaccine tested in mice and cats

By Zhou, Qun et al.·Published in Microbial pathogenesis·2024·College of Animal and Veterinary Sciences, China·View original on PubMed

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Original publication title: Preparation of a novel type I feline coronavirus virus-like particle vaccine and its immunogenicity in mice and cats.

Species:
cat

Plain-English summary

A group of cats was vaccinated with a new type of feline coronavirus (FCoV) vaccine to see if it could help protect them from this serious illness. The vaccine showed promising results, as all vaccinated cats developed high levels of antibodies against the virus. Additionally, after a booster shot, some cats that had previously tested positive for FCoV showed a significant drop in the virus in their feces, and two cats even tested negative for the virus afterward. This new vaccine could be an effective way to prevent FCoV infections in cats.

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Abstract

Feline coronavirus (FCoV) infection is a leading cause of death in cats. In this study, we produced FCoV-I virus-like particles (VLPs) containing E, M, N, and S proteins using a baculovirus expression system and mixed VLPs with the adjuvants MF59 and CpG 55.2 to prepare an VLP/MF59/CpG vaccine. After immunization of mice with the vaccine, IgG specific antibodies titers against S and N proteins increased to 1:12,800, and IFN-γand IL-4splenocytes were significantly increased. Following immunization of FCoV-negative cats, the S protein antibodies in immunized cats (5/5) increased significantly, with a peak of 1:12,800. Notably, after booster vaccination in FCoV-positive cats, a significant reduction in viral load was observed in the feces of partial cats (4/5), and the FCoV-I negative conversion was found in two immunized cats (2/5). Therefore, the VLP/MF59/CpG vaccine is a promising candidate vaccine to prevent the FCoV infection.

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Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/39019122/