伝染性でんせんせい Noun Noun English jmdict 1 nouns which may take the genitive case particle 'no'noun (common) (futsuumeishi) medicine infectious;contagious 湿疹も伝染性だって。 The rash is, um, also incredibly contagious.
伝染性単核球症でんせんせいたんかくきゅうしょう Noun English jmdict 1 noun (common) (futsuumeishi) medicine infectious mononucleosis;mono;glandular fever