Before revision: US President Richard Nixon greeting the Apollo 11 astronauts in NASA's mobile quarantine facility A quarantine is a restriction on the movement of people, animals and goods which is intended to prevent the spread of disease or pests.
After revision: ,US President Richard Nixon greeting the Apollo 11 astronauts in NASA's mobile quarantine facility A quarantine is a restriction on the movement of people, animals and goods which is intended to prevent the spread of disease or pests.