Conventionally thinking says infectious diseases are caused by bacteria and viruses -- living agents with their own genetic instructions encoded in DNA (or its chemical and genetic relative, RNA).

• 传统的看法是，传染性疾病是由细菌或病毒引起的，这些生命因子有它们自身的，编码于DNA(或DNA的化学与遗传学对应物rna)的遗传指令。