1. Analysis of canine parvoviruses circulating in Australia reveals predominance of variant 2b and identifies feline parvovirus‐like mutations in the capsid proteins
- Author
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Maura Carrai, Vanessa R. Barrs, Julia A. Beatty, Gianvito Lanave, Joanne Meers, Mark Kelman, Kylie Parry, Emily Kwan, Jennifer Hill, Nicola Decaro, and Vito Martella
- Subjects
Asia ,Parvovirus, Canine ,040301 veterinary sciences ,animal diseases ,viruses ,Feline parvovirus ,Virus ,Enteritis ,Evolution, Molecular ,Parvoviridae Infections ,0403 veterinary science ,Feces ,03 medical and health sciences ,Dogs ,Antigen ,medicine ,Animals ,Dog Diseases ,Antigens, Viral ,Phylogeny ,030304 developmental biology ,0303 health sciences ,General Veterinary ,General Immunology and Microbiology ,biology ,Australia ,Canine parvovirus ,04 agricultural and veterinary sciences ,General Medicine ,biology.organism_classification ,medicine.disease ,Antigenic Variation ,Virology ,Vaccination ,Amino Acid Substitution ,Capsid ,Viral evolution ,Mutation ,Cats ,Capsid Proteins ,Feline Panleukopenia Virus - Abstract
Canine parvovirus (CPV) is a major enteric pathogen of dogs worldwide that emerged in the late 1970s from a feline parvovirus (FPV)-like ancestral virus. Shortly after its emergence, variant CPVs acquired amino acid (aa) mutations in key capsid residues, associated with biological and/or antigenic changes. This study aimed to identify and analyse CPV variants and their capsid mutations amongst Australian dogs, to gain insights into the evolution of CPV in Australia and to investigate relationships between the disease and vaccination status of dogs from which viruses were detected. CPV VP2 sequences were amplified from 79 faecal samples collected from dogs with parvoviral enteritis at 20 veterinary practices in five Australian states. The median age at diagnosis was 4 months (range 1-96 months). Only 3.7% of dogs with vaccination histories had completed recommended vaccination schedules, while 49% were incompletely vaccinated and 47.2% were unvaccinated. For the first time, CPV-2b has emerged as the dominant antigenic CPV variant circulating in dogs with parvoviral enteritis in Australia, comprising 54.4% of viruses, while CPV-2a and CPV-2 comprised 43.1% and 2.5%, respectively. The antigenic variant CPV-2c was not identified. Analysis of translated VP2 sequences revealed a vast repertoire of amino acid (aa) mutations. Several Australian CPV strains displayed signatures in the VP2 protein typical of Asian CPVs, suggesting possible introduction of CPV strains from Asia, and/or CPV circulation between Asia and Australia. Canine parvoviruses were identified containing aa residues typical of FPV at key capsid (VP2) positions, representing reverse mutations or residual mutations retained from CPV-2 during adaptation from an FPV-like ancestor, suggesting that evolutionary intermediates between CPV-2 and FPV are circulating in the field. Similarly, intermediates between CPV-2a-like viruses and CPV-2 were also identified. These findings help inform a better understanding of the evolution of CPV in dogs.
- Published
- 2020