There are about 30 different vaccines for COVID-19 around the world. Only the most "luxurious ones" such as Pfizer-BioNTech, Moderna and AstraZeneca are nucleic

There are about 30 different vaccines for COVID-19 around the world. Only the most "luxurious ones" such as Pfizer-BioNTech, Moderna and AstraZeneca are nucleic acid vaccines which use mRNA or DNA. It's a "superior" technology because it costs less and our own bodies do the work so to speak. Viruses or subunits of viruses don't have to be synthesized in a lab, so the challenges which come with that don't have to be dealt with. I'm pretty sure that this is the future of vaccines anyway.