There's another universal kind-of-vaccine in development, which doesn't tell your body what to recognize but instead tells your body how to react (primes the immune system to respond faster to respiratory infections with localized antibodies, etc)

A glass of water is safe with no side effects.

A glass of water can kill you if ingested wrong, say no to DHMO!

The original press release stated this was done using machine learning, which has been a mainstay in biomedical science for a while. It's what "AI" used to refer to before the current generation of bullshit generators.

it’s the stringent verification of results that makes it useful

It's a jet injector.

Numerous studies have found cross-infection of diseases from jet injections. An experiment using mice, published in 1985, showed that jet injectors would frequently transmit the viral infection lactate dehydrogenase elevating virus (LDV) from one mouse to another.[16] Another study used the device on a calf, then tested the fluid remaining in the injector for blood. Every injector they tested had detectable blood in a quantity sufficient to pass on a virus such as hepatitis B.[15]

No, because Vaccines don't kill Covid. Vaccines teach your immune system to respond better and on the whole have better outcomes. If vaccines killed Covid, then they would give a shot to everyone with Long Covid and cure them.

They don't know yet, they haven't been told what to feel.

Great question. Most of them probably more so I'd imagine still