human microbiota green concept outline

background bacteria bacterial bacteriology bacterium banner biology cells chemical circle collection color colored colorful concept contaminant danger dangerous dark design discovery education element epidemic flora graphic green healthcare horizontal human icon illustration immune isolated life line linear lined logo macro microbiology microbiota microorganism microscopic mold molecule oraganism organism outline parasite pathogenic pictogram research science set sick sign silhouette simple spore structure style substance symbol symbols system test thin vector virus