What makes something a "genuine vaccine"?
The confusion has arisen because Pfizer is made by genetically modifying its structure, but that has no bearing at all on us.
The Pfizer vaccine is an mRNA, m = messenger. It does not interfere with our DNA but uses the infected cell to produce the real vaccine, the spike protein.
The AZ vaccine is a real virus, it is called a vector virus because it is genetically modified to contain a small fraction of Covid RNA. This virus had some of its genes removed to stop it replicating itself in our body. The virus is used to transfect a large quantity of HEK (human embryonic kidney cells). The HEK cells are genetically modified and brewed in the traditional sense like you would brew beer. After a few days, the virus invade the HEK cells, get itself reproduced in very large quantity and kill all the HEK cells. It sounds gruesome but that's just the way it works. The virus is then extracted from the resulting soup and purified by centrifugation. That virus concentrate is then bottled up as AZ vaccine. After injection, the virus invade our cells and get our cells to produce the spike protein that you have heard talked about last year. The spike protein produced by the AZ vaccine is very similar to that produced by the Pfizer. That's the real vaccine.
The Pfizer vaccine is encapsulated in a fatty shell like a tiny Ferrero rocher. It is seen as food and swallowed by our cells so gives little to no reaction after injection. It's only when it starts to work that you may see some side effects.
NHS yellow card system shows roughly twice as many adverse effect reports after AZ injection compared to Pfizer but that 's only superficial comparison.
So to recap, the real vaccine is the spike protein of SARS-COV2. It is produced by our body and can't give us the disease. It tells our body: try to get me. Our body will figure out how to destroy the spikes. It will take time for our body to learn how to do that well. About 1-3 months.
Some people are good at it, some aren't. That's just down to your genetic.
Any country can build their own facilities to make Covid vaccines but they still need to respect copyrights.