axenic
bacteria
bacterium
biology
bloodsucker
blue
board
cell
circle
class
conference
danger
deadbeat
display
donut
education
epidemy
flat
germ
goad
idler
infectious
isolated
lecture
lecturer
microbe
microorganism
pathogen
person
pest
pictogram
presentation
provocative
report
research
ring
round
school
screen
seminar
slideshow
sphere
stirrer
student
sucker
symbol
training
vector icon
virus
white background
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