epidemic

1. Origins, structure, and basic meaning

• Structure: 疫 has 9 strokes and appears in words related to infectious disease.
• Basic usage: 免疫 is read めんえき, and 検疫 is read けんえき.

2. Common pitfalls and similar expressions

• Immunity and quarantine
  • 免疫を獲得する means to acquire immunity.
  • 空港の検疫 refers to quarantine checks at an airport.
  • 免疫 names immunity in the body, while 検疫 names a quarantine procedure.