VOCABULARY

  • annually

  • avoid

  • cause

  • cemetery

  • elderly

  • fever

  • flu

  • frequently

  • guarantee

  • impact

  • infect

  • influenza

  • mild

  • mucous

  • occur

  • particular

  • prevent

  • preventive

  • prolong

  • protect

  • severe

  • shot

  • sneeze

  • sore

  • symptom

  • throat

  • victim

  • virus

  • CLOSE