To differentiate it from other gram positive, bacteria that are coccus.

Two studies conducted by scientists at the University of Maryland and the F.D.A. found that several chicken and meat samples were contaminated with the drug-resistant bacteria Enterococcus faecium and salmonella which is the leading cause of food poisoning.

this MacConkey with crystal violet can grow enterococcus

A VRE infection is a Vancomycin resistant enterococcus infection. This means an enterococcus bacteria is present and it is resistant to the antibiotic Vancomycin.

yes