Lancet-shaped diplococci

Definition

Lancet-shaped diplococci are a type of bacteria that appear as pairs of oval-shaped cells with pointed ends under a microscope. They are often associated with Streptococcus pneumoniae, a common cause of bacterial infections in the nervous system.

5 Must Know Facts For Your Next Test

1. Lancet-shaped diplococci are characteristic of Streptococcus pneumoniae, which can cause meningitis and other severe infections.
2. These bacteria are gram-positive and typically arranged in pairs.
3. Streptococcus pneumoniae is encapsulated, which helps it evade the host immune system.
4. Diagnosis often involves Gram staining and culture methods to visualize the characteristic shape and arrangement.
5. Vaccines like the pneumococcal vaccine can help prevent infections caused by lancet-shaped diplococci.

Review Questions

Related terms

Streptococcus pneumoniae:

A gram-positive bacterium that appears as lancet-shaped diplococci and causes various infections including meningitis.

Gram Staining:

A method used to differentiate bacterial species into gram-positive and gram-negative based on their cell wall composition.

Meningitis:

An inflammation of the protective membranes covering the brain and spinal cord, which can be caused by bacterial infections like those from Streptococcus pneumoniae.