booster
carona
caronavirus
cell
concept
conceptual
contagion
corona
coronavirus
covid19
cure
deadly
death
disease
doctor
dosage
dose
drug
epidemic
flu
health
herd
hope
hospital
human
illness
immune
immunity
immunization
injection
medication
medicine
metaphor
needles
novel
prevention
research
science
shot
sickness
slow
spread
syringe
treatment
vaccination
vaccine
viral
virus