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Other common causative organisms include other Gram-negative aerobes, Streptococcus spp. and anaerobes.
The causative agent is Aeromonas salmonicida a non-motile, Gram-negative aerobic bacillus, typically 1 µm x 2 µm.
B. fragilis is a Gram negative short bacillus which demonstrates pleomorphism.
A fluorescent, Gram-negative bacterium was consistently isolated from diseased tissues onto King's B medium.
The slide shows a large number of Gram-negative diplococci present in a few of the pus cells (polymorph neutrophil leukocytes ).
