Prevalence of swine Torque teno virus genogroups 1 and 2 in Japanese swine with suspected post-weaning multisystemic wasting syndrome and porcine respiratory disease complex.
Torque teno virus (TTV) was first isolated from a human hepatitis patient in 1997. TTV was also identified in several animals, including pigs, cattle, sheep, cats and dogs. In this study, we analysed the prevalence of swine TTV genogroups 1 (TTV1) and 2 (TTV2) in Japanese swine populations with suspected post-weaning multisystemic wasting syndrome and porcine respiratory disease by using a nested polymerase chain reaction method. Of 153 serum samples from 16 different herds in Japan, TTV1 was detected in 46 samples (30%), TTV2 in 47 samples (31%) and both in 15 samples (10%). There was no significant difference in the detection rate among geographical regions. The overall prevalence rate of TTV genogroups was significantly lower in < or = 30-day-old pigs (11%) compared to that in older age groups (54-82%). These results suggest that swine TTV may be widespread in post-weaning pigs and could play aetiological roles in pig diseases in Japan. This is the first report on the prevalence of swine TTV in Japan.
Taira
Osamu
O
Nippon Institute for Biological Science, 9-2221-1 Shinmachi, Ome, Tokyo 198-0024, Japan. o.taira@nibs.or.jp
Ogawa
Hirohito
H
Nagao
Aki
A
Tuchiya
Kotaro
K
Nunoya
Tetsuo
T
Ueda
Susumu
S
D000818:Animals; D018173:Circoviridae Infections / Q000453:epidemiology / Q000662:veterinary / Q000821:virology; D004266:DNA Virus Infections / Q000662:veterinary* / Q000821:virology; D004279:DNA, Viral / Q000235:genetics; D007564:Japan / Q000453:epidemiology; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction / Q000662:veterinary; D053570:Porcine Postweaning Multisystemic Wasting Syndrome / Q000453:epidemiology / Q000821:virology*; D012120:Respiration Disorders / Q000662:veterinary* / Q000821:virology; D034421:Sus scrofa; D022783:Torque teno virus / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification
D004279:DNA, Viral