of the streptococcus. gram-positive coccus or spherical bacteria. streptococcus pyogenes cells.

pyogenes vector illustration streptococcus spherical bacteria cells immunization medicine pathogenic virus bacterium disease health biology illness human microbe medical microbial microbiology antimicrobial antibiotic microcosmos pathogen science cellular organism germs bacillus electron 3d microscope streptococcaceae lactobacillales lactic acid phylum cell anaerobe pneumonia microscopic pneumoniae pneumococcus type pneumococcal infection