R21/Matrix M- the new vaccine candidate, is a modified version of RTS, S - another candidate against malaria by GlaxoSmithKline, Walter Reed Institute of Research, Bill and Melinda Gates Foundation with the PATH Malaria Vaccine Initiative, that has been in development for more than 30 years now...

https://www.financialexpress.com/lifestyle/health/what-went-into-making-of-malaria-vaccines-new-version-and-why-it-matters/2245534/

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