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amoeba bacillus background bacteria bacterial bacterium bad banner blue cell chemical cholera circle collection colony color colored colorful contaminant danger dangerous design discovery disease education element epidemic epidemiology flora fungi graphic horizontal human icon illustration immune infected infection influenza isolated lactobacillus life line linear logo macro microbe microbiological microbiology microbiota microorganism mold molecule oraganism organism outline pandemic parasite pathogen pathogenic science set sick sign silhouette simple style symbol system test thin vector virus white