感染

1. Origins, structure, and basic meaning

• Structure: 感染 (かんせん) is a noun that also forms a する verb for infection spreading to a living organism.
• Basic usage: It describes how plants become infected or infection spreading through a town in a story.
  • 授業では植物が病気に感染する仕組みを扱った。 — In class, we covered how plants become infected with disease.
  • 物語の町では未知の病原体による感染が広がっていく。 — In the story's town, infection caused by an unknown pathogen is spreading.

2. Common pitfalls and similar expressions

• Becoming infected and infection spreading
  • 病気に感染する describes an organism becoming infected, while 感染が広がる describes the infection extending through a wider area.