The mRNA types produce two types of immunity.  One that is present in bodily 
fluids, such as blood.  This is the type that produces antibodies and is the 
way that historical vaccines work.  mRNA vaccines also trigger cellular 
immunity, whereby production of phagocytes removes virus-infected cells.  
Arguably there's a third way, the stimulation of cells to produce substances 
called cytokines which play a part in the way other cells are involved in 
immune response.  Plus it's new technology and I'm interested.

> On 04 March 2021 at 18:07 Bob Pdml <pdm...@gmail.com> wrote:
> 
> 
> Why would you choose one (type of) vaccine over another, given that they all 
> seem more or less equally effective, have no serious side-effects, and mostly 
> all require two doses?
> 
> > On 4 Mar 2021, at 17:19, mike wilson <m.9.wil...@ntlworld.com> wrote:
> > 
> > Excellent stuff!  I was spiked about three weeks ago.  Knocked me on my 
> > backside for a couple of days but wore off very quickly.  Mine was 
> > Astra-Zeneca (no choice; I would have preferred the mRNA type to the viral 
> > vector one) which is supposed to be intramuscular.  If that's how it was 
> > administered, it was the most painless IM injection I've ever had - in 
> > fact, the most painless injection full stop.
> >> 
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