alert
area
art
attention
background
bacteria
beware
biohazard
biological
black
caution
cautionary
chemical
concept
contaminated
contamination
danger
death
design
disaster
disease
drawing
emergency
graphic
graphics
grunge
hazard
hazardous
health
healthcare
isolated
isolation
pandemic
poison
poster
protection
quarantine
risk
safety
sign
signage
stop
symbol
text
threat
virus
warning
yellow