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mRNA is method (if talk about creation of some substance), it may be used for vaccine creation or some medical drug or just another substance for biochemistry
so answer to your question is sure: influenza, Ebola, Toxoplasmose... you can read more here: Chahal JS, Kahn OF, Cooper CL, et al. Dendrimer-RNA nanoparticles generate protective immunity against lethal Ebola, H1N1 influenza, and Toxoplasma gondii challenges with a single dose. Proc Natl Acad Sci USA. 2016; 113(29): E4133-42
... or in easy reading here: https://www.phgfoundation.org/docume...efing-note.pdf - Introduction on RNA vaccines by Cambrige UNI, 2018
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dab69 (November 18th, 2020)
As many articles point out (including the following one) it has been a long road to develop a viable mRNA vaccine and it’s only recent developments that seem to be promising. As Dr Wikipedia points out there are no mRNA vaccines currently approved for general human use
https://www.nature.com/articles/nrd.2017.243
Look, mRNA vaccines for general use does not exists not because it is hard to invent, but because they are few times more expensive than "regular vaccines". That why already exists mRNA vaccines against cancer, Zika and Ebola and does not exists mRNA vaccines against measles for example - we don't need them because already existing cheap "regular vaccines" do their job.
There is no science break trough in mRNA vaccine against COVID, method known and many times proved its effectiveness. The only task what all manufacturers doing now - to choose which segment of virus RNA insert into vaccine's molecule, make chain of biochemical processes for to produce vaccine cheap, clear from additional chemical reagents and make it easy for to transport and use.
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