aids
alert
avian
background
bird
caution
concept
danger
disease
ebola
epidemic
evd
flu
germ
global
h1n1
h5n1
h7n9
hand
hazardous
health
hiv
human
illness
infection
influenza
kill
medical
medicine
no
outbreak
painted
pandemic
panic
pig
prevention
red
risk
road
safety
sickness
sign
sky
stop
swine
symbol
vaccine
viral
virus
warning
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