1College
of Veterinary Medicine, Jilin Agricultural University, Changchun,
Jilin Province 130118, China 2Jilin
Institute of Animal Husbandry and Veterinary Science, Changchun,
Jilin Province 130062, China 3The ThirdAffiliated Hospital, Changchun University of Chinese
Medicine, Changchun, Jilin Province 130117, China *Corresponding author:
huguixue901103@163.com
Abstract
Feline calicivirus (FCV), a highly contagious virus, is one of the major causes
of upper respiratory infections in domestic cat populations and wild felines. It
is a ubiquitous issue around the world, which constantly demands veterinary
attention. Vaccination for FCV has generally been proposed as a cure for its
infections. However, the high antigenic variability of this virus hinders the
development of efficacious FCV vaccines. In this study, the experimental
inactivated vaccine was developed with strain FCV CH-JL2 at 108.00
TCID50/mL, 1% binary ethylenimine (BEI) was utilized for inactivation
at 37°C for 48 h, then was mixed with aluminum hydroxide which was used as an
adjuvant. Through regular observation and monitoring, it was confirmed that the
kittens in each group had a good mental state and appetite after the
vaccination, and their body temperature was normal. Compared with the control
group, the antibody levels increased, and no adverse reactions were seen. Its
effects were evaluated using the previously constructed animal infection model
to measure clinical symptoms after vaccination and FCV challenging. All kittens
were challenged with FCV CH-JL2 at 42 days of post vaccination (dpv). The
clinical signs of body weight, body temperature, viral shedding, survival rates
were monitored daily during 14 days of post challenge (dpc). It has been shown
that serum IgG levels and neutralization titer were significantly higher than
the commercial inactivated vaccine, and kittens manifested normal clinical
signs, good mental status and appetite after vaccination and subsequent viral
challenging, the protection rate is 100% (5/5). Collectively, these preliminary
data indicate that inactivated vaccine can provide complete protection against
infection caused by the challenge FCV CH-JL2 for kittens, and FCV CH-JL2 strain
is a promising candidate for developing a safe and effective FCV vaccine in the
future.
To Cite This Article:
Guo Y, Liu H, Wang Q, Yi S, Niu J, Li D, Cui Z, Wang K, Shao Hand Hu G, 2022.
assessment of the protective efficacy of a feline calicivirus inactivated
vaccine using in vivo FCV CH-JL2 infection.
Pak Vet J, 42(3): 328-333. http://dx.doi.org/10.29261/pakvetj/2022.030