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.
CRE (carbapenem-resistant Enterobacteriaceae) bacteria are members of related bacterial genera that are commonly found almost everywhere in the world, often colonizing humans and animals (living in or on humans and animals mucosal surfaces, gastrointestinal tracts, and on some areas on the skin).owever, CRE possess a unique genetic makeup that allows the bacteria to make an enzyme that protect CRE bacteria from a powerful antibiotic: carbapenem. The most notable genera that can share and even transfer this genetic trait to other members of the Enterobacteriaceae are E. coli and Klebsiella pneumoniae.