bacteria
book illustration
clean
cold
cold prevention
cold protection
concrete
contact infectious
correct
description
finger
germs
guide
hand
hand joints
hands of the people
health
health management
how
how to wash
hygiene management
illustrations
infection control
infection prevention
instructions
left hand
line art
measures
measures against infectious diseases
nail
prevention
procedure
realistic
right hand
secondary contamination
secondary pollution measures
simple
sterilization
vector
virus
wash
wash your hands
with both hands
wrinkles
wrist