Sequence comparison and analyses of porcine circovirus type 2 of seventeen strains from Guangdong province.

According to the sequences of porcine circovirus type 2(PCV2) isolates in GenBank,the genomes were amplified by PCR from the tissues in suspect swine"high fever" from Guangdong province,followed by sequencing and analysis.The results showed that the complete genome of each of seventeen isolates were 1 767 or 1 768 bp in length.There were 96.7% to 99.8% homologies among the complete genomic nucleotides of seventeen isolates,and 96.7% to 99.8% homologies among isolates abroad in GenBank.The ORF2 of the seventeen isolates had 89.5% to 100% nucleotide sequence homologies and 97.5% to 100% amino acid homologies.Phylogenetic analysis showed that two strains belong to a subtypes,ten strains belong to the b subtypes and five strains belong to the d subtypes among the total seventeen.