種痘

1. Origins, structure, and basic meaning

• Structure: 種痘 is read as しゅとう and is a historical medical noun for smallpox vaccination or inoculation.
• Basic usage: Use 種痘を受ける for an individual receiving it and 種痘が広まる for the practice spreading through society.

2. Common pitfalls and similar expressions

• Historical scope
  • It does not name vaccination in general; it specifically belongs to the history of smallpox prevention.
• Individual procedure and social spread
  • 受ける describes a person receiving the inoculation, while 広まる describes wider adoption of the practice.