| low pathogenicity h5n2 avian influenza outbreak in japan during the 2005-2006. | at the end of may 2005, a low-pathogenicity avian influenza (lpai) virus of subtype h5n2 was isolated for the first time from chickens in japan. through active and epidemiological surveillance, 5.78 million chickens on 41 farms were found to be affected and 16 h5n2 viruses were isolated. antigenic analysis revealed antigenic similarity of these isolates. phylogenetic analysis showed that they originated from a common ancestor and clustered with the h5n2 strains prevalent in central america that ... | 2007 | 17524576 |
| human h5n2 avian influenza infection in japan and the factors associated with high h5n2-neutralizing antibody titer. | h5n2 avian influenza virus infection of humans has not been reported thus far. the first h5n2 avian influenza infection of poultry in japan occurred in ibaraki. | 2008 | 18603824 |
| spatial analysis of low pathogenic h5n2 avian influenza outbreaks in japan in 2005. | we conducted a spatial analysis of low pathogenic h5n2 avian influenza (ai) outbreaks, that affected 41 chicken farms in japan in 2005. a statistically significant (p=0.001) cluster of ai-positive farms was identified in the central part of ibaraki prefecture. inside the ai cluster, the density was high for both chicken farms and chicken population, the proportion of layer finisher type farms was high and the farm size was large. we considered it important to take precautions for ai outbreaks in ... | 2009 | 19652489 |
| serological survey of avian h5n2-subtype influenza virus infections in human populations. | to investigate the distribution of antibodies against h5n2 influenza virus in humans living in ibaraki prefecture, japan, 266 single serum samples were collected to perform serological tests. results were compared to investigate the relationship between positive results and several factors. the number of positive serum neutralization antibody titers (> or = 40) against avian influenza virus a/h5n2 was significantly greater (p < 0.05) among poultry workers, in comparison to a japanese healthy pop ... | 2009 | 19189196 |
| risk factors for the introduction of avian influenza virus into commercial layer chicken farms during the outbreaks caused by a low-pathogenic h5n2 virus in japan in 2005. | avian influenza outbreaks caused by a low-pathogenic h5n2 virus occurred in japan from june to december 2005. all 41 affected farms housed layer chickens. therefore, we conducted a case-control study targeting all commercial layer chicken farms within the movement restriction areas in ibaraki prefecture, where most outbreaks were detected, to investigate the risk factors for the introduction of avian influenza virus (aiv). four variables were identified as risk factors associated with the introd ... | 2007 | 18035971 |