Toxocara canisToxocaraToxocariasisLarva Migrans, VisceralAntibodies, HelminthAscariasisEhrlichia canisEye Infections, ParasiticAntigens, HelminthCentral Nervous System HelminthiasisDog DiseasesEosinophiliaDogsHelminthiasis, AnimalParasite Egg CountParasitic Diseases, AnimalLarvaAscaris suumDirofilaria immitisSeroepidemiologic StudiesIntestinal Diseases, ParasiticAlbendazoleAnthelminticsZoonosesDNA, HelminthSoilHelminth Proteins