Translation

世界的大流行 / パンデミック / 世界規模の流行

Meaning

A pandemic is an epidemic that has spread across many countries or continents. The practical trap is using pandemic for any frightening outbreak; it is about geographic scale, not just fear or severity.

Examples

• その感染症は複数の大陸に広がり、パンデミックになりました。
  The disease spread across several continents and became a pandemic.
• 一つの学校での流行は pandemic ではありません。
  An outbreak in one school is not a pandemic.