Cloning and Sequence Analysis of ORF3 Gene of 2 Strains of Isolation and Identification of PEDV

For the study,prevention and control of Guangdong area of porcine epidemic diarrhea,this experiment first by determining the presence of porcine epidemic diarrhea virus in swine fecal samples of RT-PCR method,followed by the use of Vero cells were blind transfer,the nucleic acid identification of virus,RT-PCR,TCID50determination,gene sequencing and sequence analysis method,to confirm separation 2 strains of porcine epidemic diarrhea virus strains,named as PEDV GDKP-2013 and PEDV GDKP2-2013,through ORF3 gene nucleotide sequence analysis,consistency of the amino acid sequence of GDKP-2013 strain and GDKP2-2013 strain and classic reference strain JX261936-CHGD-01,98.2%,98%; JQ039903-CH-GD-2011,98.6%,98.4%;AF353511-CV777,95.4%,95.1%;KC344845-STPED0810,95.1%,94.8%;EU054929-DR13,95.5%,95.2%;KF272920-USA-Colorado-2013,95.1%,94.8%,showed that the 2 strains of virus,and domestic isolates of amino acid homology,with South Korea,Thailand and American isolates of amino acid homology is lower,and amino acids,homologous vaccine reference strains is relatively low;analysis of gene system evolution,GDKP-2013 strain and GDKP2-2013strain were mainly in the branches and attenuated vaccine strain(b branch) between genetic evolution relationship is far.