streptococcus structure icon, outline style

bacillus bacteria bacteriology bacterium bifidobacteria bifidobacterium biological biology biotechnology black bulgaricus cell culture digestion enterococcus escherichia faecium fermentation flora fungi germ good human icon illustration intestinal isolated lactobacillus lactococcus line medical medicine micro microbe microbiological microbiology microflora microorganism microscopic organism outline pathogenic probiotic science sign streptococcus structure thin vector virus