pathogen round concept creative outline

allergen ameba amoeba bacillus background bacteria bacterial bacteriology bad biochemistry biological cell chemical cholera circle circular coli collection concept contaminant contaminants dangerous design disease diseased dust element epidemiology experiment fungi germs health healthcare hygiene icon illustration infection isolated lactobacillus line linear logo micro microbiology microscope minimal modern mold molecular molecule oraganism organism outline pandemic pathogen pathogenic pollen prebiotic probiotic probiotics red research round science scientific set shape sick sign silhouette small style substance symbol thin vector