bacteria. streptococcus

antibiotic attack bacillus bacteria bacteriology bacterium biological biology body cell cocci coccus disease epidemic fever grampositive health human illness illustration infection macro medical medicine meningitis micro microbe microbial microbiological microbiology microorganism microscope microscopen microscopic nthrough organism pathogen pathogenic pathology pneumonia pneumoniae purulent pyogenic science sepsis sick sickness staphylococci staphylococcus streptococcus threedimensional virus