Diagnostic Challenges in Canine Parvovirus 2c in Vaccine Failure Cases

Viruses

Ania Ahani Azari¹  Malihe Akbarzadeh²  Reza Amanollahi²  ShiowJing Khuu³  Maryam Sharifian³  HiuYing Esther Yip³  Lucy Woolford³  Anne Peaston³  RohanSuresh Kumar³  Aliakbar Khabiri³  Farhid Hemmatzadeh³  Razi Jafari Jozani³  Georgia Wallace³  Kandarp Patel³ 

[1] Department of Microbiology, Gorgan Branch, Islamic Azad University, Gorgan 4914739975, Iran;Faculty of Veterinary Medicine, Shiraz University, Shiraz 69155-71441, Iran;School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy Campus 5371, Australia;

关键词: Canine Parvovirus Type 2c;    Vaccine failure;    qPCR, antigen rapid CPV/CCV tests;    test sensitivity;    test specificity;    Bayesian latent class analysis;   

DOI  :  10.3390/v12090980

来源: DOAJ

【 摘 要 】

In this study, three different diagnostic tests for parvovirus were compared with vaccination status and parvovirus genotype in suspected canine parvovirus cases. Faecal samples from vaccinated (N17) and unvaccinated or unknown vaccination status (N41) dogs that had clinical signs of parvovirus infection were tested using three different assays of antigen tests, conventional and quantitative PCR tests. The genotype of each sample was determined by sequencing. In addition to the suspected parvovirus samples, 21 faecal samples from apparently healthy dogs were tested in three diagnostic tests to evaluate the sensitivity and specificity of the tests. The antigen test was positive in 41.2% of vaccinated dogs and 73.2% of unvaccinated diseased dogs. Conventional PCR and qPCR were positive for canine parvovirus (CPV) in 82.4% of vaccinated dogs and 92.7% of unvaccinated dogs. CPV type-2c (CPV-2c) was detected in 82.75% of dogs (12 vaccinated and 36 unvaccinated dogs), CPV-2b was detected in 5.17% dogs (one vaccinated and two unvaccinated) and CPV-2a in 1.72% vaccinated dog. Mean Ct values in qPCR for vaccinated dogs were higher than the unvaccinated dogs (p = 0.049), suggesting that vaccinated dogs shed less virus, even in clinical forms of CPV. CPV-2c was the dominant subtype infecting dogs in both vaccinated and unvaccinated cases. Faecal antigen testing failed to identify a substantial proportion of CPV-2c infected dogs, likely due to low sensitivity. The faecal samples from apparently healthy dogs (n = 21) showed negative results in all three tests. Negative CPV faecal antigen results should be viewed with caution until they are confirmed by molecular methods.

【 授权许可】

Unknown