[[Fasciculus:Influenza virus.jpg|thumb|200px|Virus biologicum quod [[morbus|morbum]] [[influentia]]m efficit.]]
'''Virus''' (-i, ''n.'', plur. ''vira'' <ref name=Stearn1983>Stearn, WWilliam T. (1983). ''Botanical Latin. History, grammarGrammar, syntaxSyntax, terminologyTerminology and vocabularyVocabulary.'' (3rd edition). Newton Abbot London: David Charles.</ref>) est obiectum [[biologia|biologicum]] ex [[acidum deoxyribonucleinicum|acido deoxyribonucleinico]] et [[proteinum|proteinis]] [[lipidum|lipidisque]]. Virus non [[vita|vivit]], sed in [[cellula|cellulis]] crescit. Quia multiplicatur utens [[DNA]], virus est "pseudovitale." DNA virale in [[mRNA]] transcribitur; quod invicem in [[peptidum|peptida]] transfertur, virus cum in cellula normaliter, sed ex informatione genetica virali peptida viralia producens.