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Cocci: Focus on the spherical bacteria
Cocci: Focus on the spherical bacteria
What are cocci?
Cocci are spherical bacteria that can belong to the Gram-positive or Gram-negative bacteria, depending on the structure of their cell wall. Their name is derived from the Greek word "kokkos", which means "kernel" or "berry". They can occur singly, in pairs, chains, clusters or other arrangements, which is often used for identification and classification.
Types of cocci
- Diplococci
Description: These occur in pairs.
Example: Streptococcus pneumoniae, the causative agent of pneumonia.
- Streptococci
Description: These form chains of several cells.
Example: Streptococcus pyogenes, responsible for scarlet fever and sore throats.
- Staphylococci
Description: These appear in grape-like clusters.
Example: Staphylococcus aureus, known for infections and antibiotic resistance (e.g. MRSA).
- Sarcinae
Description: These form cube-shaped clusters of eight or more cells.
Example: Sarcina ventriculi, a bacterium that can occur in the stomach.
- Tetrads
Description: These form groups of four cells.
Example: Micrococcus luteus, a bacterium found on the skin.
Gram-positive and gram-negative cocci
- Gram-positive cocci: These have a thick cell wall made of peptidoglycan and turn purple when Gram-stained. Examples are Staphylococcus and Streptococcus.
- Gram-negative cocci: These have a thinner cell wall and an outer membrane. Examples are Neisseria gonorrhoeae (causative agent of gonorrhoea) and Neisseria meningitidis (meningitis pathogen).
Significance of cocci
Cocci are of great medical and ecological importance:
- Pathogenic cocci: Many cocci are pathogens that cause infections such as pneumonia, blood poisoning or skin infections.
- Normal flora: Some cocci, such as Micrococcus and certain Staphylococcus species, are part of the natural human microbiota.
- Research and medicine: The study of cocci has led to important advances in microbiology and the development of vaccines and antibiotics.
Prevention and treatment
The control of infections caused by pathogenic cocci is a central aspect of medicine:
- Hygiene measures: Regular hand washing and disinfection reduce the risk of infection.
- Antibiotics: The targeted use of antibiotics, supported by resistance tests, is crucial.
- Vaccines: Vaccinations, such as those against meningococci, protect against serious infections.
Conclusion
Cocci are a diverse and medically relevant group of bacteria whose study is making a significant contribution to the understanding of infections and microbial communities. From harmless skin inhabitants to dangerous pathogens, cocci play a central role in our lives.
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