The building blocks had already been worked on prior to this. This has been discussed in other threads as well if you want to know. It's not that they came up with a vaccine this year. They had already been working on one but financial, public interest and more meant it didn't go too too far.
A good but very brief description I found was:
"During the SARS1 (SARS-CoV-1) outbreak 18 years ago, researchers started looking at that virus, and other coronaviruses, and found a really promising vaccine target on the virus cell surface -- which is a protein called spike. That protein is what binds to human cells and leads to an infection. So about 10 years ago the science wheels started churning out strategies to vaccinate against SARS1. Unfortunately, funding dried up for SARS1 as that virus never made its way to the U.S., so a vaccine didn’t actually get developed. However, the research on the virus and ideas of how to vaccinate against it were already available."
"SARS2 (SARS-CoV-2, our current situation) uses almost the exact same version of that protein to infect cells and uses the exact same receptor on human cells. Due to these similarities, scientists were able to pick up where they left off, which sped up the process dramatically. Further, vaccination strategies have improved significantly in the last 10-plus years, particularly in the past couple of years with the mRNA technology that Moderna and Pfizer have utilized. All of these companies basically just took the DNA or RNA backbone of a vaccine that they had already built and plugged in the SARS2 spike protein’s genetic information."
Add in a global interest such that we really haven't seen with billions of dollars that frees up things and well it may still seem fast but there's at least reasons behind it.
This isn't to say your hesitancy in the vaccine isn't valid, it is, and others share your concern. I just wanted to give you some information.
_______________
Back to the thread topic for me