I don't know much about the "new" covid19 vax... which process they are using to instigate an immunological response... However, MOST vaccines only use some "non-infectious" pieces of the actual virus or bacteria to get the immunological response anticipated. You are not going to "GET" the flu, or pneumonia or any other of the diseases the vaccine is inoculating for. Doesn't mean you won't get some other illness, and just cuz you get the flu vaccine this year, doesn't mean it covers ALL the circulating flu virus types (Of which there are many many many!) so it's still only 40% to 60% effective.
It's like showing my cat a dead mouse and saying, "You see this? Don't let any of these in the house!" And the cat goes, "Ok. No mice allowed." I don't need to show the cat the LIVE mouse for the cat to realize all mice are bad. As long as the cat is young, strong, and has a good hunting instinct.
Same thing with the body's response to vaccines. Shown DEAD piece of a virus or bacteria, and the body should say, "No Flu allowed!" or, "No Pneumonia allowed!" as long as it's "young, strong, and has a good hunting instinct!" LOL Any one of those things not there can foul up the whole shenanigans (immunological response). "Attenuated" or "Modified Live" vaccines are basically me taking that dead mouse, (a mouse unable to do any damage to my house and unable to grow more mice) and SHAKING it like it's alive so my cat knows that sometimes the mouse will move! LOL The reason to use dead pieces of a virus or disease, or attenuated or modified-live pieces of the "non-infectious" parts, would be to prevent any accidents like me trying to show my cat a live mouse but then dropping the live mouse in my house when the cat wasn't looking. The mouse now has the chance to run rampant and propagate and make more mice before the cat even had a chance to know mice are bad! Best just not to take that chance! LOL
There are some vaccines that do use whole-y live viruses to get an immune response. Smallpox vaccine would be one BUT they are NOT using the actual smallpox virus. A variant called vaccinia is used. Because of the similarities between vaccinia and the smallpox virus, the antibodies produced against vaccinia have been shown to protect against smallpox. You will be actually “GETTING” a disease, the vaccinia disease, which doesn’t cause many issue for people, unlike the smallpox which kills 30% of infected people and causes blindness and horrible scarring. A little “cough cough” is way better than death, blindness and scarring, I’d say.
The reason many people feel poorly after getting their flu shot, or any other vaccination, is the ramping up of the immune response to a foreign substance in the body. That takes "energy." The energy you would normally use for your day-to-day work, is now being used for an immune response to keep you from getting sick. You are going to feel tired, lack of energy, maybe even a little feverish. And sometimes there's a slight "allergic" response to the stuff in the vaccine. But you are NOT getting even a mild case of whatever disease the vaccine is intended for... unless you were already in the incubation period of exposure when you got the vaccine.
The fact that people are getting sick from the covid19 vax may be cuz they are vaccinating immune-suppressed people first? They just can't handle that "ramping up" of energy use. Since I don't know how they are making this vaccine, but it could be a fairly new use of the variants withIN the vaccination (the fluid or “frozen” parts) not even dealing with the pieces of the Covid19 virus that people are having problems with? Or, it could be, as global conspirators theorize, population control. !!! LOL
Who knows… but I hope it's not that one... LOL