In article ,
nightjar wrote:
On 01/04/2021 12:28, Fredxx wrote:
On 01/04/2021 12:24, nightjar wrote:
...
The full approval process can take a year or even more, which isn't
usually a problem, given that the vaccine has often taken years to
develop. Seasonal flu has to be developed and approved between flu
seasons.

I could be wrong but I thought the typical seasonal flu vaccines have
already been approved, and the ultimate choice was which one to
manufacture according to it's prevalence in the population.

Flu mutates at a very high rate, so a vaccine that may have been
effective against one strain one year may not be as effective, if at
all, another year. Unless a vaccine can be demonstrated to be at least
50% effective, it won't be approved.

Don't 'they' guess some time ahead of the flu season and make vaccines
based of that best guess? Which isn't always correct?

--
*Confession is good for the soul, but bad for your career.

Dave Plowman London SW
To e-mail, change noise into sound.