catastrophic (adj): related to an event that causes one person or a group of people personal suffering
unprecedented (adj): something that has never happened or been done before
crackdown (n): severe action taken to restrict the activities of criminals or of people opposed to the government
commemoration (n): an action, or a ceremony that makes people remember and show respect for an important person or event in the past
outbreak (n): the start of something unpleasant, especially violence or a disease
quarantine (n): a period of time when an animal or a person that has a disease is kept away from others