Browse the glossary using this index
Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL
An outbreak is when a disease spreads quickly in a group of people (or animals or plants or …) in one place at one time. When a bunch of people in one town get food poisoning, that’s an outbreak. An epidemic is a really big outbreak, but still just one place at one time.