Raoultella

Updated: 2026-09-11

Overview

Raoultella is a bacterial genus first reclassified from Klebsiella in 2001, named after French microbiologist Didier Raoult. It comprises species like R. planticola and R. ornithinolytica, distinguished by genetic and biochemical traits. These bacteria thrive in diverse environments, including water, soil, and hospital settings. While often benign, Raoultella can act as opportunistic pathogens, particularly in immunocompromised patients. Their clinical relevance has grown with reports of antibiotic-resistant strains, necessitating accurate identification in medical microbiology.

Key Features

Raoultella species are Gram-negative rods, non-motile, and facultative anaerobes. They ferment sugars like glucose and lactose, producing gas—a trait shared with Klebsiella. Key differentiating features include ornithine decarboxylase activity (R. ornithinolytica) and growth at 10°C. Genomic studies reveal plasmids harboring resistance genes, contributing to multidrug resistance. Some strains exhibit unique metabolic capabilities, such as histamine production in fish spoilage (R. planticola), posing food safety concerns.

Application Areas

In clinical contexts, Raoultella is implicated in urinary tract infections, bacteremia, and pneumonia. Its resemblance to Klebsiella complicates diagnosis, requiring molecular methods for precise identification. Industrially, certain strains show promise in biodegradation (e.g., phenolic compounds) and enzyme production. Research explores their role in nitrogen fixation and potential probiotic applications, though safety assessments are critical due to pathogenic variants.

Precautions

Handling Raoultella in labs demands Biosafety Level 2 (BSL-2) practices, especially with clinical isolates. Misidentification risks underscore the need for MALDI-TOF or genomic sequencing. In healthcare, antibiotic stewardship is vital to curb resistance. Environmental monitoring in food processing can mitigate histamine-related risks from contaminating strains.

B2B Procurement Guide

Research suppliers offering authenticated strains (e.g., ATCC, DSMZ) with full metadata. Verify strain purity via certificates of analysis and opt for lyophilized cultures for long-term storage. For clinical use, prioritize suppliers complying with ISO 13485 for diagnostic-grade materials. Budget for confirmatory testing, as prices range from $200–$500 per strain, depending on exclusivity and characterization depth.