flu, influenza –n. a common sickness caused by a virus that causes fever, weakness, pain and breathing problems

pandemic –n. the fast spread of an infectious disease to many people over a very large area of the world

respiratory –adj. related to breathing and the lungs

knocked down –v. greatly reduce, to cause to fall

capacity –n. the ability to provide a service for those who need it

contributor –n. one of several actions that help bring about a result