bacteria, human microbiome

bacteria microbe human cell microbiome normal flora microbiocenosis normocenosis normobiocenosis overgrowth bacterial intestine intestinal escherichia coli ecoli illustration pathogen pathogenic disease lactobacillus acidophilus bifidobacterium yersinia klebsiella salmonella shigella medicine medical research science health biology microbiology biological citrobacter enterobacter skin rod shaped staphylococcus streptococcus pneumococcus pneumoniae aureus coccus cocci spherical