A species of facultatively anaerobic, Gram negative, rod shaped bacterium assigned to the phylum Proteobacteria. This species is oxidase negative, fermentative, susceptible to ampicillin, amoxicillin-clavulanate, ceftazidime, ceftriaxone, cefotaxime, cefepime, ofloxacin, gentamicin, carbenicillin, and amikacin but resistant to cephalothin, penicillin G, and vancomycin. A rare human pathogen, it can be isolated from human blood, stool, urine, wounds, conjunctiva, respiratory tract, and peritoneal dialysate of immunocompromised patients.

Any bacterial organism that can be assigned to the species Ewingella americana.