bacteria of different s

disease organism microscopic molecule flora epidemic gut microscope medicine pathogen bacillus biotechnology bacteriology small salmonella fermentation inflammation bacteria bacterial citrobacter closeup microbe colon mycobacterium escherichia nosocomial background lactobacilli illustration antibiotic sepsis klebsiella scientific micro microorganism biochemistry system staphylococcus health shigella digestive probiotic cell pathology lactobacillus coli bifidobacterium 3d stenotrophomonas endocarditis