mRNA vaccines are not new, they have been under development for over 20 years. It's just that they don't work. Also the spike protein doesn't always stay in the muscle tissue, but can escape and float round the body, before settling in important organs. There is no research or information on the effect this will have, but it is certainly not beneficial.
I understand how they work, and they are a step closer to the use of the live virus. I just don't understand why they don't use the live virus to create natural immunity. Oh wait, there isn't any money in that.
to create a 'live virus' that is attenuated to not replicate as much. requires incubating it at low temperatures, over multiple generations until its attained a function that at normal body temperatures it cant function its replication effectively
(send a man to the arctic to have kids, grandkids, great grandkids where they get used to having sex in the snow.. then you will find if you take that multi-generational descendant to the carribean. he will be too sunburned and sweaty and heat stroked and not wanna have sex.)
this is the method that usually takes a long time to produce. and does not always work
some say that a live virus has more then just the spike protein identifier and having more then just the spike identifier means more things for immune system to learn about a virus.
the problem is the more different things it tries to learn to attack. the less it can concentrate on any single battle plan. thus making the immune system too diluted with too many differing antibodies.
by identifying one aspect that really does affect the body. like its spike 'key' into a cells 'lock' to open a cell up for invasion. this can be used more effectively to identify the virus holding the key before it gets to a lock. or identify an intruder if it gets to a cells door with the key
by having antibodies (small little Y shape) trained for the spike. these can latch onto the spike(key) and block it from being able to fit the lock. thus no invasion into a cell. and then send a message to kill the thing they just blocked with the other immuno cells
but if you have a mix of antibodies lokking for different things. the amount of antibodies that wil latch onto the spike is decreased
more varied antibodies=less antibodies for specific function..
in short the simpleist solution is the quickest solution