Plague was one the worst diseases in past. Hundreds of thousands of people died of plague. There are many examples in history that many villages and cities were ruined due to plague and there are symptoms of theirs. If a person is caught by the plague, he was expelled from the town. Now a days we r safe from plague and it is due to the discovery of vaccines. Moreover people are more careful about their health. They have clean environment and fresh food to eat. this is all due to miracles occurring in science and technology.