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Bacillus anthracis drawn by Robert Koch

Anthrax bacilli from a mouse spleen after 24 hours of culture in a drop of aqueous humor; (a) in the filaments elongated round spores have developed at regular intervals like a string of pearls; (b) some threads are in the process of dissolving, the spores are free, single or clustered together. (Source: Koch R. Die Ätiologie der Milzbrand-Krankheit, begründet auf die Entwicklungsgeschichte des Bacillus Anthracis. Beiträge zur Biologie der Pflanzen 1876;2[2]:283. Image edited to remove unrelated images and to improve sharpness and contrast by Dr. Douglas J Lanska.)

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