alert
area
attention
bacteria
beware
bio
biohazard
biohazard symbol
biologic
biological
biology
black
caution
chemical
contamination
danger
dangerous
epidemic
forbidden
hazard
hazardous
icon
illustration
infectious
isolated
lab
laboratory
medical
poison
protect
protection
research
restricted
risk
safety
science
security
sign
signal
substance
symbol
toxic
virus
warn
warning
waste
weapon
yellow
zone
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