agent
background
bacteria
bio
biohazard
biologic
biological
biology
black
caution
chemical
danger
dangerous
environment
epidemic
experiment
flat
forbidden
hazard
icon
illustration
infectious
isolated
lab
laboratory
logo
medical
protection
research
restricted
safety
science
scientific
security
sign
signal
silhouette
simple
single
symbol
toxic
transparent
virus
warfare
warn
warning
waste
weapon