TrichinellosisTrichinellaVietnamTrichinella spiralisWalrusesFood ParasitologyEndemic DiseasesUrsidaeAntibodies, HelminthIdahoCarnivoraVietnam ConflictFuneral RitesMeatAnimals, WildMeat ProductsDisease OutbreaksSus scrofaMebendazoleFood IndustryZoonosesAlbendazoleAntigens, HelminthFood ContaminationAnthelminticsSwineGoiter, EndemicSwine DiseasesLarvaPopulation SurveillanceEnzyme-Linked Immunosorbent AssayDefoliants, Chemical