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 200X photomicrograph magnification of a direct fluorescent antibody (DFA) stained sample revealed the presence of rod… https://www.rawpixel.com/image/2288444/free-photo-image-bacteria-laboratoryFree 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 close left lateral view of a female Oriental rat flea, Xenopsylla cheopis that transmit the bacterium Yersinia pestis, the… https://www.rawpixel.com/image/2288454/free-photo-image-insect-plague-ratFree Image from public domain license