Swarming growth on culture is characteristic of which Gram-negative organism -
Pr.mirfabilis & Pr.vulgaris swarms on solid culture media .discrete colonies are seen in young cultures but thereafter actively motile cells spread on the surface of the plate in successive waves to form a thin film layer in concentric circles. REF:Ananthanarayan & Panicker's Textbook of Microbiology 8th edition pg no:280-281
Clostridium welchii
Clostridium tetani
Bacillus cereus
Proteus mirabilis
general microbiology