tetraccoci structure. bacteria tetracoccus. infographics. on background.

anatomy aureus bacillus bacteria bacterium biology cell cocci diplococci diplococcus disease flat illness illustration infection inflammation label luteus medical medicine microbe microbiology micrococcus microorganism microscopic monococcus morphology organism pathogenic pneumonia prokaryotic pyogenes sarcinia science scientific spiral staphylococci staphylococcus streptococci streptococcus structure system tetracoccus tetrad types vector ventriculi vibrio virus viruses