A taxonomically heterogeneous group of bacteria that cannot catabolize glucose and are thus unable to ferment.

Examples of non-fermenting bacteria that cause infections in people are Pseudomonas aeruginosa, Acinetobacter baumannii and Burkholderia pseudomallei. Ubiquitous in nature and highly adaptable, non-fermenting Gram-negative bacteria are an important cause of hospital-acquired infections (HAIs). These species are often multidrug-resistant.