attention
background
bacteria
beware
bio
biohazard
biologic
biological
blue
caution
chemical
chemicals
contaminated
contamination
danger
dangerous
design
disaster
disease
emblem
emergency
epidemic
flat
hazard
icon
illustration
infection
isolated
label
line
linear
medical
minimal
mortal
notice
outline
pandemia
pandemic
pollution
radiation
radioactive
risk
sign
symbol
toxic
virus
warn
warning
waste
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