agent
alert
area
art
background
bacterial
beware
bio
biologic
biological
black
caution
clip
closeup
contagious
contaminated
contamination
danger
dangerous
environment
forbidden
hammad
hazard
hazardous
icon
illustration
infectious
isolated
label
notice
pictogram
poison
protect
protection
restricted
risk
safety
sign
substance
symbol
threat
toxic
triangle
virus
warfare
warn
waste
weapon
yellow