caricature picture of salmonella holding a sign

bacillus bacteri bacterial bacterium bifidobacteria bifidobacterium biology board bring bulgaricus cartoon caution cell character cherichia clue coli cute design emoticon emotion escherichia expression forewarning funny hands happy icon illustration lab laboratory legs mark mascot medical microbe microscopic mycobacterium probiotic research salmonella science sign smile street streptococcus style symbol vector virus warning