probiotic in blood, healthy arteria grey icon.

probiotic blood healthy arteria wc icon disease medicine science virus harmful cell bacteria biology illness infection microbiology microscopic health microorganism molecule immune allergen bifidobacterium bug flora intestine intestinal gastrointestinal lactobacillus dietary fermentation inflammation stomach digestion abdominal bacteriology bacterium enterobacteria fatigue business symbol thin design element isolated pictogram grey gray monochrome