Nematodozho, bemorihoi odam, hayvonot va rastani, ki nematodaho ba vujud meorand. Nematodaho dar aksari uzvu boftahoi odamu hayvonot (mushak, jigar, gurda, medayu ruda va gayra) va qismhoi rastani (resha, poya va barg) paraziti mekunand.
Nematodozho 2 khel meshavand: geonematodozho (angezandai onho dar muhiti beruna — khok, ob va gayra inkishof meyoband) va bionematodozho (inkshofashon ba ivazshavii organizmi sohib vobasta ast). Odam az Nematozho odatan hangomi bo ob va khurokikho furu burdani tukhm yo kirminai nematodaho siroyat meyobad. Tukhm va kirminai nematodaho dar muhiti beruna faqat dar sharoithoi muayyan (harorat, kofi budani nami va oksigen) inkishof meyoband. Az Nematozho dar odam beshtar askaridoz, enterobioe, trikhosefalyoz, trikhinellyoz va gayra pahn shudaand.
Nematozho dar hamai hayvonhoi muhrador duchor meshavand. Angezandai Nematozho karib dar tamomi uzvu boftahoi organizmi hayvonot paraziti mekunand. Pahnshavii Nematodozho ba iqlim, mavjudiyat va miqdori organizmho, manbai siroyat, sharoithoi nigohdorii hayvonho, etimodnokii tadbirhoi tabobatiyu profilaktiki va digar omilho vobasta ast. Ba chorvodori beshtar askaridoz, amidostomoz, bunostomozho, diktiokaulyoz, trikhinellyoz va gayra zarar merasonand. Nigared niz Kasalihoi nematodii rastany.