[genetic characterization of human parainfluenza virus 3 circulating in gansu and shaanxi provinces from 2009 to 2011]. | to investigate the genetic characterization of human parainfluenza virus-3 (hpiv-3) circulating in gansu and shaanxi provinces of china, 719 throat swabs were collected from pediatric patients with acute respiratory infections from 2009-2011. multiplex rt-pcr was used to screen common respiratory viral pathogens. for hpiv-3-positive specimens, nested rt-pcr was used to amplify the hn gene of hpiv-3. the nucleotides of hemagglutinin-neuraminidase(hn)gene of 13 hpiv-3 positive strains identified i ... | 2013 | 24386839 |