The capsule is found most commonly among gram-negative bacteria:
- Escherichia coli (in some strains)
- Neisseria meningitidis.
- Klebsiella pneumoniae.
- Haemophilus influenzae.
- Pseudomonas aeruginosa.
- Salmonella.
- Acinetobacter baumannii.
What types of bacteria are encapsulated?
The term 'encapsulated bacteria' refers to bacteria covered with a polysaccharide capsule. Examples of such bacteria include Streptococcus pneumoniae, Klebsiella, Haemophilus influenzae, Neisseria meningitidis, and Pseudomonas aeruginosa.
Are all bacteria capsulated?
Most of Gram positive bacteria do not have so called capsules. Exo polysaccharide (EPS) or polypeptide capsules are mostly property of Gram negative bacteria even though some Gram positive bacteria may display capsules.
