Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú yđề tài: Swine influenza viruses isolated in 1983, 2002 and 2009 in Sweden exemplify different lineages. | Kiss et al. Acta Veterinaria Scandinavica 2010 52 65 http content 52 1 65 AVS ACTAVETERINARIA SCANDINAVICA BRIEF COMMUNICATION Open Access Swine influenza viruses isolated in 1983 2002 and 2009 in Sweden exemplify different lineages I r-4- t Ấ i r- r- 1 3 a z l A D A I I -2 4 fZ. I z r 1 I h A Z xt I I 1 4 Ct c m m L 1 c VO z rỉ I A Ỉ Z zk 1 c A Z r Dz I 1 1 4 Dz r A I I I Z1 rz 1 3 Istvan Kiss Adam Balint Giorgi ivieireveli Eva tmmoin FrederiK Widen Sandor BelaK rer waiigren Abstract Swine influenza virus isolates originating from outbreaks in Sweden from 1983 2002 and 2009 were subjected to nucleotide sequencing and phylogenetic analysis. The aim of the studies was to obtain an overview on their potential relatedness as well as to provide data for broader scale studies on swine influenza epidemiology. Nonetheless analyzing archive isolates is justified by the efforts directed to the comprehension of the appearance of pandemic H1N1 influenza virus. Interestingly this study illustrates the evolution of swine influenza viruses in Europe because the earliest isolate belonged to classical swine H1N1 the subsequent ones to Eurasian avian-liKe swine H1N1 and reassortant avian-liKe swine H1N2 lineages respectively. The latter two showed close genetic relatedness regarding their PB2 HA NP and NS genes suggesting common ancestry. The study substantiates the importance of molecular surveillance for swine influenza viruses. Findings The records of the swine influenza history in Europe start with H1N1 viruses dating back to 1938 when an H1N1 strain of early human influenza virus gene pool was isolated from pigs in Great Britain 1 . In 1950 classical swine influenza viruses SIVs were isolated in Czechoslovakia but after that no swine influenza virus detection was reported for more than two decades 1 2 . Between the mid 1970 s and mid 1980 s human origin H3N2 influenza viruses and classical SIVs circulated simultaneously. In 1979 an H1N1 influenza virus of
