pathogenicity round in thin line style

abstract analysis bacillus background bacteria bacterial bacteriology biology care cell chemical circle circular collection colony concept contaminant contaminants danger dangerous discovery disease element epidemic experiment flora formula graphic health hygiene icon illness illustration influenza isolated lactobacillus line linear logo medical micro microbe microorganism microscopic mirco modern molecular outline pandemic pathogen pathogenic pathogenicity pictogram pollen poster prebiotic probiotic probiotics research round science scientific set shape sick sign silhouette simple small spore style symbol system test thin vector