Related Experiment Videos
Type III group B streptococcal infections in mice: bacteremia and meningitis following oral inoculation
Abstract:
The successful production of disease in mice by a type III group B streptococcus is described in this report. When injected intravenously, 106 organisms produced a fulminating sepsis and resulted in 100% mortality within 48 h. Inoculation of 108 - 109 organisms directly onto the surface of the oropharynx progressed to bacteremia and meningitis in greater than 50% of animals. In a group of mice treated with penicillin immediately after oropharyngeal inoculation, the incidence of invasive bacteremia was reduced to 30%. The use of this animal model for studying the pathogenesis and treatment of experimentally produced meningitis and eradication of oropharyngeal colonization is discussed.
Insights
Researchers developed a mouse model for group B streptococcus (GBS) infection. This model effectively simulates sepsis, bacteremia, and meningitis, aiding in studying GBS disease and treatment strategies.
Area of Science:
- Microbiology
- Infectious Diseases
- Animal Models
Background:
- Group B Streptococcus (GBS) is a significant cause of neonatal infections.
- Understanding GBS pathogenesis and developing effective treatments are critical public health priorities.
Purpose of the Study:
- To establish and characterize a reproducible mouse model for GBS-induced disease.
- To investigate the efficacy of penicillin in preventing GBS invasive infections.
Main Methods:
- Intravenous injection of GBS (10^6 organisms) induced fulminating sepsis and 100% mortality in mice.
- Oropharyngeal inoculation (10^8 - 10^9 organisms) led to bacteremia and meningitis in over 50% of animals.
- Penicillin treatment post-inoculation reduced invasive bacteremia incidence to 30%.
Main Results:
- A mouse model successfully replicates GBS sepsis, bacteremia, and meningitis.
- Intravenous GBS administration results in rapid, high mortality.
- Oropharyngeal GBS challenge leads to systemic infection, which can be partially mitigated by penicillin.
Conclusions:
- This mouse model is valuable for studying GBS pathogenesis and treatment.
- The model can be used to evaluate strategies for eradicating oropharyngeal GBS colonization.
- Findings support the investigation of therapeutic interventions for GBS meningitis and sepsis.