Toxocara canisToxocaraToxocariasisGiardiaLarva Migrans, VisceralGiardia lambliaAntibodies, HelminthAscariasisEhrlichia canisGiardiasisEye Infections, ParasiticAntigens, HelminthCentral Nervous System HelminthiasisDog DiseasesParasite Egg CountDogsEosinophiliaHelminthiasis, AnimalParasitic Diseases, AnimalLarvaAscaris suumDirofilaria immitisSeroepidemiologic StudiesIntestinal Diseases, ParasiticZoonosesAlbendazoleAnthelminticsDNA, HelminthSoilHelminth ProteinsFeces