A 1000X photomicrograph magnification of numerous, rod-shaped, Gram–negative, Yersinia pestis bacilli. https://www.rawpixel.com/image/2288448/free-photo-image-bacteria-laboratory-microscopeFree Image from public domain licenseA 3D image of a group of Gram-positive, Streptococcus pneumoniae bacteria. Original image sourced from US Government… https://www.rawpixel.com/image/2288323/free-photo-image-bacteria-science-biologyFree Image from public domain licenseA 3D image of a group of Gram–positive, Corynebacterium diphtheriae, bacteria. Original image sourced from US… https://www.rawpixel.com/image/2288345/free-photo-image-bacteria-biology-microscopeFree Image from public domain licenseA 3D image of a group of diplococcal, Gram-negative, Neisseria meningitidis, bacteria. Original image sourced from US… https://www.rawpixel.com/image/2288319/free-photo-image-bacteria-science-public-domainFree Image from public domain licenseA photomicrograph reveals the presence of numerous, rod-shaped, Gram–negative, Yersinia pestis bacilli. https://www.rawpixel.com/image/2288446/free-photo-image-bacteria-medical-organs-microscopeFree Image from public domain licenseA 3D image of a group of Gram–negative, Chlamydia psittaci bacteria. Original image sourced from US Government… https://www.rawpixel.com/image/2288337/free-photo-image-chlamydia-science-labFree Image from public domain licenseA photomicrograph reveals numerous Gram–negative, Francisella tularensis coccobacilli, the bacterium responsible for… https://www.rawpixel.com/image/2288585/free-photo-image-microscope-cdc-gram-negative-bacteriaFree Image from public domain license