Here's what you need to know about bacterial capsules:

* Composition: Capsules are typically made of polysaccharides (sugars) or sometimes proteins.

* Function: They act as a protective barrier around the bacterial cell, shielding it from:

* Harmful substances: Capsules can protect bacteria from things like antibiotics, disinfectants, and the host's immune system.

* Dehydration: They can help prevent bacteria from drying out.

* Phagocytosis: Capsules can make it harder for white blood cells to engulf and destroy bacteria.

* Virulence Factor: The presence of a capsule can make bacteria more virulent (disease-causing).

* Examples: Many pathogenic bacteria, like *Streptococcus pneumoniae* (causes pneumonia) and *Neisseria meningitidis* (causes meningitis), have capsules that contribute to their ability to cause disease.

Let me know if you'd like to learn more about capsules or other bacterial structures!