adult
aged
air
allergy
asian
bad
care
chinese
corona virus
coronavirus
danger
disease
dust
epidemic
face
fever
flu
health
ill
illness
infected
infection
infectious
influenza
mask
medical
medicine
mers
pandemic
people
person
pollution
prevention
problem
protect
protection
quarantine
reject
safe
safety
senior
sick
sickness
suffer
symptoms
temperature
virus
wearing