"That's because a virus is like a Trojan horse: it cannot enter Troy on its own. However, if it is helped by the Trojan people - i.e. cellular factors such as proteins and enzymes - then it can enter. We want to identify the names and addresses of all the Trojan people. Perhaps among them we can discover one "person" whom we can use to stop the virus proliferating. Of course it must be a Trojan that is not significantly important for the processes taking place in Troy."

Yes indeed. A virus is a Trojan Horse that contains instructions/blue prints on how to mass produce more Trojan Horse. This analogy, assumes Troy is a factory that can replicate large wooden horses.