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Fig. 1

A – geographic distribution of sampled farms, B – positive rates of PCV3 infection in different commercial pig farms in Xinjiang province, China
Note: Positive rate was determined based on PCR analysis of clinical samples.
A – geographic distribution of sampled farms, B – positive rates of PCV3 infection in different commercial pig farms in Xinjiang province, China Note: Positive rate was determined based on PCR analysis of clinical samples.

Fig. 2

Phylogenetic analysis of PCV3 strains based on the full-length cap gene using the neighbour-joining method
Note: The nucleotide sequences of cap gene of PCV3 strains obtained in this study and available in GenBank were used to construct a phylogenetic tree by the neighbour-joining method. Bootstrap values were calculated with 1,000 replicates. Vertical lines are used to indicate groups (or subgroups) which were referred to in the text. Filled circles indicate the PCV3 strains identified in this study
Phylogenetic analysis of PCV3 strains based on the full-length cap gene using the neighbour-joining method Note: The nucleotide sequences of cap gene of PCV3 strains obtained in this study and available in GenBank were used to construct a phylogenetic tree by the neighbour-joining method. Bootstrap values were calculated with 1,000 replicates. Vertical lines are used to indicate groups (or subgroups) which were referred to in the text. Filled circles indicate the PCV3 strains identified in this study

Genetic diversity of PCV3 strains circulating in commercial pig farms in Xinjiang province, China

PCV3 strains Group Subgroup
CN/Xinjiang-SH6/2018 1 1.1
CN/Xinjiang-TA36/2018 1 1.1
CN/Xinjiang-AL5/2018 1 1.2
CN/Xinjiang-UR22/2018 1 1.1
CN/Xinjiang-YI7/2018 2 2.1
CN/Xinjiang-CH29/2018 2 2.2
CN/Xinjiang-AK16/2018 2 2.1
CN/Xinjiang-KO17/2018 2 2.2
CN/Xinjiang-KA2/2018 1 1.1

List of primer sequences used in this study

Primer name Nucleotide sequence Position in reference Product size
(5′→ 3′) sequence (bp)
FP1 CCGTAGAAGTCTGTCATTCCAG 1383–1404
RP1 AAGCCCTGGCACGCCAACCAC 1796–1816 434
FP2 TTAGAGAACGGACTTGTAACGA 1343–1364
RP2 ATGAGACACAGAGCTATATTCAG 1965–1987 645

GenBank accession numbers of PCV3 strains

Strain Accession number
2164 KX458235
PCV3-US/MN2016 KX898030
PCV3-US/SD2016 KX966193
PCV3/CN/Fujian-5/2016 KY075986
PCV3/CN/Henan-13/2016 KY075988
PCV3/CN/Jiangxi-62/2016 KY075989
PCV3/CN/Chongqing-150/2016 KY075992
CN/Hubei-618/2016 KY354039
CCV-A KY363870
CCV-B KY363871
CCV-C KY363872
PCV3-China/GD2016 KY418606
PCV3/KU-1601 KY996337
PCV3/KU-1604 KY996340
PCV3/KU-1606 KY996342
PCV3/KU-1608 KY996344
PCV3/KU-1609 KY996345
P1705SCYC/2017 MF063070
16R927/2016 MF063071
PCV3-BR/RS/6 MF079253
PCV3/CN/Jiangxi-B1/2017 MF589107
PCV3/CN/Jiangxi-S1/2017 MF589133
PCV3/CN/Guangdong-CH/2016 MF589112
PCV3/CN/Guangdong-X1/2016 MF589118
309 MF589652
JX-1/CH/2017 MF677838
1621_Italy_2017 MF805719
4332-5_Denmark_2017 MF805723
4332-7_Denmark_2017 MF805724
DE2.8 MG014377
DE19.15 MG014367
DE27.16 MG014370
PCV3/HU/Szerencs/2017 MG595741
PCV3-RU/TY17 MG679916
PCV3-JSXY-201701 MG868940
PCV3-HBWH-201703 MG868941
PCV3-SH-201705 MG868945
SD MG947596
PCV3-CN2018HLG-5 MH277111
PCV3-CN2018JL-1 MH277112
PCV3-CN2018LN-3 MH277117
COL/Cundinamarca2/2018 MH327785
CN/Xinjiang-AK16/2018 MK562412
CN/Xinjiang-AL5/2018 MK562413
CN/Xinjiang-CH29/2018 MK562414
CN/Xinjiang-KA2/2018 MK562415
CN/Xinjiang-KO17/2018 MK562416
CN/Xinjiang-SH6/2018 MK562417
CN/Xinjiang-TA36/2018 MK562418
CN/Xinjiang-UR22/2018 MK562419
CN/Xinjiang-YI7/2018 MK562420
29160 NC031753

Detection of PCV3 infection in different samples from commercial pig farms in Xinjiang province, China

Clinical samples Number of samples Number of positive samples Positive rate (%) of PCV3
Lymph nodes 79 29 36.71 (29/79) a
Spleen 93 22 23.66 (22/93) a
Lung 62 9 14.52 (9/62) b
Pleural effusion 57 13 22.81 (13/57) a
Serum 102 15 14.71 (15/102) b
Total 393 88 22.39 (88/393)
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Life Sciences, Molecular Biology, Microbiology and Virology, other, Medicine, Veterinary Medicine