Bacte Part 3 Miscellaneous Gram (-) Bacilli

• Capnocytophaga are capnophilic, fusiform, or filamentous bacilli with characteristic motility: gliding motility.
• Klebsiella granulomatis, formerly Calymmatobacterium granulomatis, is the agent of granuloma inguinale or donovanosis, a Gram-negative, nonmotile, encapsulated, pleomorphic rod that may be cultured in yolk sacs or on fresh egg yolk medium.
• Granuloma inguinale (donovanosis) is a disease caused by Klebsiella granulomatis.
• Capnocytophaga, Klebsiella granulomatis, and Eikenella corrodens are now part of the Enterobactericeae family.
• Granuloma inguinale (donovanosis) in a conventional Pap test shows granulomatous inflammation with epithelioid histiocytes and lymphocytes.
• Donovan bodies, the organisms of Granuloma inguinale (donovanosis), can be seen in thin-walled intracytoplasmic vacuoles.
• Macrophages show numerous safety pin-shaped structures with polar thickening of chromatin (Donovan bodies) and a halo around them.
• Eikenella corrodens, a corroding bacterium, is characterized by pitting of the agar and produces a bleach-like odor.
• Chryseobacterium, formerly Flavobacterium, is a yellow-colored bacterium that forms yellow colonies on BAP.
• Chromobacterium violaceum, found in soil and water, has the ability to produce violacein, a purple pigment.
• Cardiobacterium hominis, normally found in the upper RT and isolated as a rare cause of endocarditis, is a nonfermentative Gram-negative bacterium.
• Alcaligenes, Achromobacter, Flavimonas, Acidovorax, Brevundimonas, Comamonas, and Ralstonia are other nonfermentative Gram-negative bacteria.