title: Genotypic lineages and restriction fragment length polymorphism of canine distemper virus isolates in Thailand.
abstract: Canine distemper virus (CDV) is known to cause multisystemic disease in all families of terrestrial carnivores. Attenuated live vaccines have been used to control CDV in a variety of species for many decades, yet a number of CDV infections in vaccinated dogs are still observed. The aims of this study were to investigate the genetic diversity of CDV lineages based on phosphoprotein (P), hemagglutinin (H) and fusion protein (F) genes and to develop the restriction fragment length polymorphism (RFLP) technique for effective differentiation among individual wild-type and vaccine lineages in Thailand. Four commercial vaccine products, thirteen conjunctival swabs and various tissues from 9 necropsied dogs suspected of having CDV infections were included. Virus isolation was performed using Vero cell expressing canine signaling lymphocyte activation molecules (Vero-DST cells). Reverse-transcription polymerase chain reaction (RT-PCR) on 3 gene regions from the dog derived specimens and the vaccines were carried out, then RFLP analysis upon F-gene amplified fragments was developed. Nucleotide sequence and phylogenetic analysis were compared with other CDV lineages in Genbank. Phylogenetic relationships revealed that CDV field isolates were separated from the vaccine lineage and could be divided into two clusters; one of which belonged to the Asia-1 lineage and another, not related to any previous recognized lineages was proposed as 'Asia-4'. RFLP patterns demonstrating concordance with phylogenetic trees of the distemper virus allowed for differentiation between the Asia-1, Asia-4 and vaccine lineages. Thus, RFLP technique is able to effectively distinguish individual wild-type canine distemper virus from vaccine lineages in Thailand.
authors.affiliation: Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: Araya
authors.initials: A
authors.lastname: Radtanakatikanon
authors.forename: Juthatip
authors.initials: J
authors.lastname: Keawcharoen
authors.forename: Na Taya
authors.initials: NT
authors.lastname: Charoenvisal
authors.forename: Yong
authors.initials: Y
authors.lastname: Poovorawan
authors.forename: Eakachai
authors.initials: E
authors.lastname: Prompetchara
authors.forename: Ryoji
authors.initials: R
authors.lastname: Yamaguchi
authors.forename: Somporn
authors.initials: S
authors.lastname: Techangamsuwan
mesh_terms: D000818:Animals; D001483:Base Sequence; D002522:Chlorocebus aethiops; D004216:Distemper / Q000821:virology*; D004217:Distemper Virus, Canine / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification*; D004285:Dogs; D014644:Genetic Variation; D005838:Genotype; D006388:Hemagglutinins / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length; D013785:Thailand; D014709:Vero Cells; D014764:Viral Proteins / Q000235:genetics
chemical_list: D006388:Hemagglutinins; D014764:Viral Proteins
keywords: Canine distemper virus; Restriction fragment length polymorphism; Thailand; Vaccine; Wild-type