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Method for inducing experimental pneumococcal meningitis in outbred mice
Damiana Chiavolini1, Sergio Tripodi, Riccardo Parigi
1Dipartimento di Biologia Molecolare, Laboratorio di Microbiologia Molecolare e Biotecnologia, Policlinico Le Scotte, Università di Siena, Viale Bracci, 53100 Siena, Italy. damianac@bu.edu <damianac@bu.edu>
BMC Microbiology
|September 24, 2004
Summary
This study presents a simple, reproducible method for inducing pneumococcal meningitis in mice. This model aids research into meningitis pathogenesis, host response, and therapeutic interventions for Streptococcus pneumoniae infections.
Area of Science:
- Infectious Diseases
- Microbiology
- Neurology
Background:
- Streptococcus pneumoniae is the primary cause of bacterial meningitis, characterized by high mortality and potential neurological deficits.
- Existing antibiotic treatments for pneumococcal meningitis have limitations, necessitating further research into pathogenesis and novel therapies.
- Animal models are crucial for understanding meningitis, host immune responses, and evaluating new drugs and vaccines.
Purpose of the Study:
- To develop and detail a straightforward, reproducible method for inducing pneumococcal meningitis in outbred mice.
- To establish a reliable animal model for studying Streptococcus pneumoniae pathogenesis and evaluating potential treatments.
Main Methods:
- Induction of meningitis in outbred mice via intracranial subarachnoid injection of Streptococcus pneumoniae.
- Testing of multiple pneumococcal serotypes (2, 3, and 4) with varying doses to determine lethal concentrations.
- Monitoring of mouse survival rates and characterization of disease progression, including systemic dissemination and histological brain analysis.
Main Results:
- A reproducible method for inducing pneumococcal meningitis in mice using the intracranial subarachnoid route was established.
- Lethal doses (50% mortality) for serotypes 2, 3, and 4 were determined as 3.2 x 10^2, 2.9 x 10^2, and 1.9 x 10^3 CFU, respectively.
- Histological analysis confirmed that the induced meningitis in mice closely mimics human pneumococcal meningitis, with observed systemic dissemination in moribund animals.
Conclusions:
- The described method offers a simple, fast, cost-effective, and reproducible approach to induce pneumococcal meningitis in mice.
- This model is effective regardless of the Streptococcus pneumoniae serotype used, providing a versatile tool for research.
- The model's ability to replicate human meningitis pathology supports its utility in preclinical studies.