Serological survey on the Newcastle disease virus infection among poultry farmers and workers of poultry processing plants [poultry]

agentes nocivos agriculteur agricultores animal animal domestique animales animals aves de corral aves domesticas birds diseases domestic animals domesticated birds facteur nuisible farmers injurious factors methode methods obreros occupations ocupaciones oiseau oiseau domestique ouvrier poultry vertebrados vertebrates vertebre virose viroses virosis volaille workers