Pathogenesis (development of disease)
Streptococci are gram-positive bacteria arranged in a chain form that can be divided into several different subgroups. Among the most important subdivisions is the Lancefield classification, according to which bacteria are divided into serogroups based on a specific structure. In addition, there are bacteria that cannot be classified into these groups.
Streptococci: serological classification (according to Lancefield).
| Serogroup | Species | Hemolysis |
| A | S. pyogenes,S. anginosus group | β(α,γ) |
| B | S. agalactiae | β (γ) |
| C | S. anginosus group,S. dysgalactiae subsp. equisimilis | β(α, γ) |
| D | S. bovis | α |
| F | S. anginosus group | β(α, γ) |
| G | S. anginosus group,S. dysgalactiae subsp. equisimilis | β(α, γ) |
| Miscellaneous | “Greening” streptococci | α(γ) |
| Not typeable | S. pneumoniae | α |
Streptococcal infections can affect any region of the body, but predominantly they play out on the skin and in the throat. Streptococcal infections continue to spread in the tissues without therapy; a brownish pus is usually present in streptococcal infections.
Etiology (causes)
Behavioral causes
- Inadequate hygiene
Causes related to disease
- Horizontal transmission from mother to child during birth.
- Immunodeficiency (immune deficiency).
- Condition after splenectomy (splenectomy).
Operations
- Tooth extractions
