pseudomonas suis pseudomonas suis pseudomonas suis is a gram-negative bacterium that causes croupous pneumonia of swine (genus sus) from which it derives its name. it was first isolated in the philippines. the type strain is atcc 11729. pseudomonas suis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. suis binomial name pseudomonas suiswoods 1930