bacteria
biohazard
caution
chinese
city
contagious
contamination
coronavirus
crowd
crowded
danger
emergency
epidemic
face
female
girl
global
hand
health care
humans
illness
infect
infection
infectious
medical
medicine
microbe
pandemic
pathogen
pathogenic
people
person
prevention
protection
public
quarantine
risk
safety
sars
security
sick
sickness
stop
transportation
tunnel
vaccine
virology
virus
woman
young
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