Qi S , Su M , Guo D , Li C , Wei S , Feng L , Sun D .
Transbound Emerg Dis. 2019 Jan 13. doi: 10.1111/tbed.13125
The emerging Porcine circovirus type 3 (PCV3) is associated with porcine dermatitis and nephropathy syndrome, reproductive failure, and cardiac and multisystemic inflammation. To trace the prevalence and evolution of PCV3 in pigs with respiratory diseases or digestive diseases in China, 616 samples were collected from 21 provinces or municipalities of China from 2015 to 2017. All samples were analyzed with PCR and a cap-gene-based phylogeny. The results indicated that the positive rate of PCV3 was 12.2% (75/616) at the sample level; 24.1% (42/174) at the farm level; 10.4% (50/480) in the digestive-disease-affected samples; 26.6% (25/94) in the respiratory-disease-affected samples; all 42 healthy samples were negative for PCV3. A statistical analysis showed that PCV3 infection was closely associated with both digestive diseases (p < 0.05) and respiratory diseases (p < 0.01). A sequence analysis revealed that the cap genes of the 51 PCV3 strains identified in our study shared nucleotide homologies of 97.2%-100% and amino acid homologies of 96.3%-100%. A total of 17 amino acid mutations were observed among Cap protein of the 51 PCV3 strains, of which R14 /K, Y23 /F, I30 /V, V48 /I, I49 /V, R132 /C, R168 /K are mutations among worldwide strains. A phylogenetic analysis demonstrated that the 51 PCV3 strains formed three clades, including PCV3a (15/51, 29.4%), PCV3b (21/51, 41.2%) and PCV3c (15/51, 29.4%). These data provide evidence that PCV3 exhibits high prevalence and genetic diversity, and is associated with digestive diseases and respiratory diseases in pig. This article is protected by copyright. All rights reserved.
This article is protected by copyright. All rights reserved.
Porcine circovirus type 3; digestive diseases; genetic diversity; molecular epidemiology; respiratory diseases