Let’s talk about mRNA vaccines—like the ones developed for COVID-19 and RSV—how they work, and why they’re different from traditional vaccines.
Unlike older vaccines that use weakened or inactivated viruses, mRNA vaccines use a tiny strand of genetic code called messenger RNA. This strand is wrapped in a lipid nanoparticle, which is basically a little fatty envelope that helps the mRNA enter your cells safely.
Once inside, the lipid layer fuses with your cell membrane and delivers the mRNA. That mRNA gives your cells instructions to make a harmless spike protein—a piece of the virus that helps your immune system recognize and build protection against it. After the message is delivered, the mRNA breaks down and disappears. It doesn’t linger in your body.
There’s a common myth that mRNA vaccines can alter your DNA. That is not scientifically possible. The mRNA never enters the nucleus of your cell—where your DNA lives—so it has no way to change your genetic code.
mRNA technology is a powerful tool in modern medicine, and understanding how it works can help you make informed, empowered decisions about your health.
