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New 23-valent pneumococcal vaccine in relation to pneumococcal serotypes in systemic and non-systemic disease
Abstract:
The serotype distribution of 3631 strains of Streptococcus pneumoniae, isolated from various specimens obtained from patients was determined by coagglutination and included serotyping within a total of 13 serogroups. The results of serotyping of isolates from Scotland demonstrated that the new 23-valent pneumococcal vaccine includes serotypes which accounted for 91% strains associated with systemic disease and 79% strains isolated from other anatomical sites. Altogether, 114 strains (3.1%) were not typable because they did not possess a type-specific capsule; these were commonly isolated from eyes (12%).
Insights
The 23-valent pneumococcal vaccine covers most Streptococcus pneumoniae strains causing systemic disease (91%) and other infections (79%). Some strains lacked type-specific capsules, particularly from eye infections.
Area of Science:
- Microbiology
- Immunology
- Vaccinology
Background:
- Streptococcus pneumoniae causes significant global disease burden.
- Pneumococcal vaccines are crucial for disease prevention.
- Understanding serotype distribution is vital for vaccine efficacy.
Purpose of the Study:
- To determine the serotype distribution of Streptococcus pneumoniae isolates.
- To evaluate the coverage of the 23-valent pneumococcal vaccine against prevalent serotypes.
Main Methods:
- Coagglutination method used for serotyping.
- Analysis of 3631 Streptococcus pneumoniae strains from diverse patient specimens.
- Serotyping included 13 distinct serogroups.
Main Results:
- The 23-valent pneumococcal vaccine targets serotypes responsible for 91% of systemic disease strains.
- Vaccine serotypes accounted for 79% of strains from other anatomical sites.
- 114 strains (3.1%) were non-typable due to lack of specific capsules, often from ocular infections (12%).
Conclusions:
- The 23-valent pneumococcal vaccine demonstrates broad coverage against disease-causing Streptococcus pneumoniae serotypes.
- Non-typable strains highlight potential gaps and areas for further research in pneumococcal epidemiology.