enterococcus avium enterococcus avium enterococcus avium, a species of enterococcus, is most commonly found in birds. rarely, it is also a cause of infection in humans, and in such cases, may be vancomycin-resistant, and is referred to as vrea. vrea cases in humans have been successfully treated with linezolid. enterococcus avium scientific classification domain: bacteria phylum: bacillota class: bacilli order: lactobacillales family: enterococcaceae genus: enterococcus species: e. avium binomial name enterococcus avium(ex nowlan and deibel 1967) collins et al. 1984