Meningitis, Bacterial Clinical Trial
Official title:
A Human Controlled Infection Study to Assess Safety, Colonisation and Immunogenicity Following Nasal Inoculation With Reconstituted Lyophilised Wild Type Neisseria Lactamica
This study is part of a series of projects to develop and test new vaccines for meningitis. Previously researchers have given nose drops containing N. lactamica to over 350 volunteers, and shown that many of them (35-60%) can become colonised with N. lactamica and become resistant to becoming colonised with N.meningitidis without causing any illness or disease. In the future the study team would like to find out how N.lactamica helps children resist N.meningitidis, and develop new vaccines that exploit that mechanism.
In this pilot research, the research team will develop and validate a modification of the
methodology previously used in another UK-based human challenge experiments. The research to
be conducted in this study will inform the study team whether intranasal inoculation of
reconstituted lyophilised Nlac (hereafter, lyoNlac), can result in immunising colonisation of
participants and the optimal dose to achieve this.
Previous challenges have been conducted using frozen stocks of Nlac but this is relatively
unsatisfactory because of instability of frozen stocks, and will not be practical in Mali.
The facility to reconstitute dry powdered lyoNlac into water and inoculate as a nose drop
will greatly simplify the experimental method. However, it is not known whether lyoNlac can
be inoculated directly into volunteers and induce successful colonisation.
In summary this is a pilot study of the safety, efficacy and immunogenicity of the intranasal
inoculation of healthy human volunteers with lyoNlac. This study will determine the efficacy
of lyoNlac as an agent for inducing nasopharyngeal colonisation with this organism, which is
an important methodological development for ease of administration of Nlac in experimental
human challenge studies. The study team will aim to determine the dose of inoculum required
to induce colonisation in 80% of volunteers (the Standard Inoculum or SI). This SI will be
used in future studies aiming to optimise duration of colonisation and immunogenicity induced
by lyoNlac.
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