3rd
background
booster
booster shot
can
change
choice
concept
conceptual
corona
coronavirus
covid
covid 19
covid19
cube
cubes
dice
epidemic
green
idea
immune
immunity
immunization
infection
injection
pandemic
prevention
protection
refreshment
serum
shot
shots
symbol
text
therapy
third
treatment
turn
vaccinate
vaccinating
vaccination
vaccine
virus
word
words