| newcastle disease virus surveillance in hong kong on local and imported poultry. | surveillance of apparently healthy ducks, geese and fowl originating in hong kong and the people's republic of china at a poultry dressing plant in hong kong yielded 67 isolates of newcastle disease virus. more than twice as many viruses were isolated from the cloaca than from the trachea. twelve representative isolates were examined in virulence tests--all six of the fowl isolates and two of five duck isolates behaved as velogenic strains, the other four were lentogenic. | 1978 | 725336 |
| nine disease outbreaks associated with myxoviruses among ducks in hong kong. | | 1971 | 4367727 |
| isolation of newcastle disease virus from phasianidae birds in hong kong. | | 1978 | 711939 |
| incidence and preliminary characterisation of a hitherto unreported, serologically distinct, avian paramyxovirus isolated in hong kong. | twenty-seven apparent paramyxoviruses, unrelated to known avian paramyxoviruses, were isolated at a hong kong dressing plant from the trachea or cloaca of birds originating from hong kong and the people's republic of china. a total of 2443 apparently healthy ducks, geese and fowls was sampled and isolation frequencies were 1.3%, 1.0% and 0.5% respectively. twenty of the isolates were from the cloaca; 11 were obtained in association with newcastle disease virus and one with an avian influenza vir ... | 1978 | 705044 |
| diversity of influenza a virus subtypes isolated from domestic poultry in hong kong. | the second phase of a 2-year influenza virus surveillance programme of domestic avian species in hong kong (up to october 1977) yielded influenza a virus, newcastle disease virus, and hong kong paramyxovirus, as well as unidentified haemagglutinating agents. these viruses were isolated from the trachea or cloaca of apparently healthy domestic ducks, geese, and chickens originating from china and hong kong. twenty-five combinations of haemagglutinin and neuraminidase surface antigens were identif ... | 1979 | 314357 |
| antigenic and structural relationships between avian paramyxoviruses isolated from ducks in hong kong and mississippi, u.s.a. | representative isolates of the paramyxoviruses duck/hong kong/75 and duck/mississippi/75 were shown to be serologically closely related by haemagglutination and neuraminidase inhibition tests. the structural polypeptides of these viruses were also shown to be similar. for each of the isolates tested, polyacrylamide gel electrophoresis in the presence of sds revealed a similar polypeptide pattern consisting, under reducing conditions, of seven polypeptides with apparent mol. wt. ranging from 4600 ... | 1979 | 93619 |
| avian influenza virus and newcastle disease virus (ndv) surveillance in commercial breeding farm in china and the characterization of class i ndv isolates. | in order to determine the actual prevalence of avian influenza virus (aiv) and newcastle disease virus (ndv) in ducks in shandong province of china, extensive surveillance studies were carried out in the breeding ducks of an intensive farm from july 2007 to september 2008. each month cloacal and tracheal swabs were taken from 30 randomly selected birds that appeared healthy. all of the swabs were negative for influenza a virus recovery, whereas 87.5% of tracheal swabs and 100% cloacal swabs coll ... | 2010 | 20133090 |
| characterization of class i newcastle disease virus isolates from hong kong live bird markets and detection using real-time reverse transcription-pcr. | newcastle disease viruses isolated from hong kong live bird markets (lbms) were not detected by a usda-validated matrix gene real-time reverse transcription-pcr (rt-pcr) assay. based upon phylogenetic analysis of the fusion gene, these viruses were related to lentogenic class i viruses found in u.s. lbms and wild waterfowl. an alternative real-time rt-pcr assay which complements the matrix gene assay was developed to efficiently detect class i viruses. | 2007 | 17287322 |
| the impact of a monthly rest day on avian influenza virus isolation rates in retail live poultry markets in hong kong. | retail live poultry markets (lpms) may act as a reservoir of avian influenza viruses (aiv). in this study we test the hypothesis that a rest day in the lpms where the stalls are completely emptied of poultry, cleansed, and restocked will reduce the isolation rates of avian influenza viruses. the isolation rate of h9n2 subtype viruses from chicken was significantly lower after the rest day than prior to it, indicating its impact in reducing transmission. in contrast, newcastle disease virus (ndv) ... | 2003 | 14575106 |
| isolation of ortho- and paramyxoviruses from domestic poultry in hong kong between november 1977 and october 1978 and comparison with isolations made in the preceding two years. | regular surveillance of domestic poultry from hong kong and southern china for influenza a viruses was conducted in hong kong from november 1977 to october 1978. tracheal or cloacal swabs taken from 2844 ducks, geese and fowls yielded 141 influenza viruses of which 135 were derived from ducks. the isolation rate from ducks was twice as high from the cloaca (12.1 per cent) as from the trachea (5.8 per cent). the overall frequency of isolation was 10.3 per cent and 2.3 per cent for poultry origina ... | 1980 | 7414082 |
| newcastle disease in a flock of japanese quails. | | 1968 | 5748770 |