Definition of retain. transitive verb. 1a : to keep in possession or useb : to keep in one's pay or service; specifically : to employ by paying a retainerc : to keep in mind or memory : remember.
However, some gram- positive bacteria may also have capsules. Examples for gram-negative bacteria with capsules: Escherichia â¦coli, Klebsiella pneumoniae, Salmonella. Examples for gram-positive bacteria with capsules : Bacillus megaterium, Streptococcus pyogenes, Sterptococcus pneumoniae.
1 Enterococci (genus Enterococcus) are bacteria that commonly live in the bowel and are usually resistant to many antibiotics. VRE are enterococci that have become resistant to the antibiotic vancomycin.  There are only a few antibiotics that are able to treat VRE infections.