awareness - the state of knowing about something, exposure - the state of not having protection from something, immune system - the parts and processes of the body that fight illness, adrenaline - a chemical produced by the body when we feel excited or frightened, burst - a short period of emotion or energy, vaccination - a medicine given to prevent disease, thrill - a sudden feeling of excitement or pleasure, chronic - lasting for a long time, clinical - relating to the treatment of patients, alert - very awake and aware,

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