Overview
Staphylococcus warneri is a coagulase-negative member of the Staphylococcus genus, first identified in 1975. It is part of the normal human skin microbiota but can act as an opportunistic pathogen in immunocompromised individuals. The bacterium is frequently isolated from clinical specimens and hospital environments, making it relevant for healthcare-associated infection studies. In research settings, S. warneri serves as a model organism for studying bacterial adhesion mechanisms, biofilm formation, and antibiotic resistance patterns. Its relatively low pathogenicity compared to S. aureus makes it safer for laboratory work while still providing valuable insights into staphylococcal biology.
Physical and Chemical Properties
As a Gram-positive coccus, S. warneri typically forms grape-like clusters under microscopic examination. The cells are approximately 0.5-1.5 μm in diameter and non-motile. The bacterium grows optimally at 37°C with a generation time of about 30 minutes under ideal conditions. Biochemically, S. warneri is catalase-positive and oxidase-negative. It ferments glucose anaerobically and demonstrates variable reactions in other carbohydrate utilization tests. The cell wall contains peptidoglycan and teichoic acids, characteristic of Gram-positive bacteria, with unique surface proteins that contribute to its adhesion properties.
Main Applications
S. warneri finds primary use in microbiological research and quality control applications. In pharmaceutical testing, it serves as a challenge organism for sterility testing and disinfectant efficacy evaluations. The strain's ability to form biofilms makes it valuable for studying medical device contamination and developing anti-biofilm strategies. Clinical laboratories utilize S. warneri as a quality control strain for automated identification systems and antimicrobial susceptibility testing. Its genomic similarity to more pathogenic staphylococci allows researchers to investigate virulence mechanisms without handling highly dangerous pathogens, facilitating safer experimental protocols.
Safety and Storage
While classified as a Biosafety Level 1 organism, proper handling procedures should be followed to prevent accidental exposure or contamination. Standard microbiological practices including the use of personal protective equipment (gloves, lab coat) and work in a biosafety cabinet for procedures generating aerosols are recommended. For long-term preservation, S. warneri cultures should be stored at -80°C in cryopreservation media containing 15-20% glycerol. Lyophilized preparations offer stable storage at 4°C for several years. Working cultures on agar slants can be maintained at 4°C with monthly subculturing to ensure viability.
B2B Procurement Guide
When procuring S. warneri strains, verify the supplier's accreditation (such as ATCC or other culture collection certifications). Key specifications to confirm include: strain designation (e.g., ATCC 27836), growth characteristics, antibiotic resistance profile if relevant, and any genetic modifications. For industrial applications requiring large quantities, consider purchasing master cell banks with comprehensive characterization data. Request certificates of analysis detailing purity, viability, and absence of contaminants. Lead times for specialized strains may range from 1-4 weeks depending on source and preparation requirements.
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