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