How an RNA Vaccine Protects Us From a Virus

If you have had a COVID mRNA vaccine, you may go through a brief period where you don’t feel so great. In some cases, it can feel a lot like being sick. For vaccines that are a weak form of the virus — or even a virus fragment — it’s easy to visualize how this happens — it enters your system and resembles the threat, so your immune response fights it off and retains a memory of it for next time.