Enterococcus casseliflavus ATCC 12755

Enterococcus casseliflavus ATCC 12755 is a Gram-positive, cocci-shaped bacterium that thrives optimally at mesophilic temperatures, making it a facultative anaerobe and a chemoheterotroph. This versatile microbe is commonly found in a variety of body sites across numerous species, including the gastrointestinal tracts of humans and animals, as well as in environmental settings such as soil and water.As a Gram-positive organism, E. casseliflavus retains the crystal violet stain used in the Gram-staining technique, resulting in a purple appearance under the microscope. This characteristic is indicative of a thick peptidoglycan layer in its cell wall. The cocci shape contributes to its ability to form clusters, which can be identified in laboratory cultures. Being mesophilic, it prefers moderate temperature ranges typically found in warm-blooded hosts. E. casseliflavus is a facultative anaerobe, enabling it to survive and grow in both aerobic and anaerobic environments. This adaptability is a significant aspect of its survival strategy, allowing it to colonize diverse habitats, including the intestinal tract where it can flourish alongside other gut microbiota. As a chemoheterotroph, it relies on organic compounds for energy and carbon, utilizing nutrients derived from its environment or its host. This microbe has gained attention not only for its ecological role but also for its clinical significance. While E. casseliflavus is generally considered a commensal organism, it can also act as an opportunistic pathogen, particularly in immunocompromised individuals. Notably, this strain is recognized for its ability to exhibit resistance to certain antibiotics, including vancomycin, making it a subject of interest in studies related to antibiotic resistance and hospital-acquired infections. Its presence in both health and disease contexts underscores its dual role as both a beneficial resident and a potential threat within the human microbiome.