Mankind has fought with plagues for many times, but with few victories. Many plagues disappeared not because human beings invented effective ways to fight against them, but due to some kind of rule, after taking away the lives of tens of thousands or even millions of people, they disappeared on their own for unknown reasons. Therefore, we cannot easily claim "victory" over viruses. It is like a huge ghost, only that it does not only act in the dark, and even the blazing sun cannot stop it from ravaging the world.