bacteria streptococcus pneumoniae

streptococcus pneumoniae pneumococcus bacteria medical microbes health microscopic medicine science cells biology infection microbiology microscope human life illness scientific 3d illustration sick sickness epidemic micro macro disease closeup bacteriemia sepsis fever microorganisms pathology staphylococci cocci pus surgical purulent pyogenic pneumonia meningitis pathogen pathogenic microorganism spherical coccus diplococci