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Color enhanced scanning electron micrograph (SEM) of Leptospira interrogans strain RGA. Two spirochetes bound to a 0.2 micrometer filter. Strain RGA was isolated in 1915 by Uhlenhuth and Fromme from the blood of a soldier in Belgium. Leptospira is known to cause the infectious disease leptospirosis, which attacks the liver and kidneys of humans and some animals. The disease can be transmitted via contact with infected water or urine. Colorized version of image number BB5089.