avian influenza surveillance reveals presence of low pathogenic avian influenza viruses in poultry during 2009-2011 in the west bengal state, india. | more than 70 outbreaks of the highly pathogenic avian influenza (hpai) h5n1 have been reported in poultry in the western and north-eastern parts of india. therefore, in view of the recent hpai h5n1 outbreaks in poultry, active ai surveillance encompassing wild, resident, migratory birds and poultry was undertaken during 2009-2011 in the state of west bengal. | 2012 | 22867041 |