The one you’re all getting excited about carries some serious risks

In many ways, the vaccine almost behaves like an RNA virus itself except that it hijacks your cells to produce the parts of the virus, like the spike protein, rather than the whole virus. Some messenger RNA vaccines are even self-amplifying. That means they encode not only the protein antigen of interest to elicit an immune response but also produce their own RNA dependent RNA polymerase, so that they can force the cell to replicate more copies of it.

Quelle: This is the hard-to-swallow truth about a future coronavirus vaccine (and yes, I’m a doctor) | Independent