enterobacterias. gram-negative bacterias

aeruginosa bacillus background bacteria bacterias bacteriemia bacterium biological biology closeup clostridium coli disease enterobacter enterobacterias epidemic escherichia experiment fever gramnegative health illness illustration infection klebsiella legionella macro medical medicine micro microbe microbiology microorganisms microscope microscopic mycobacterium organism pathology pestis proteus research salmonella science scientific sepsis serratia shigella sick sickness tuberculosis yersinia