- Aug 20, 2003
Viruses rely on a host to survive and replicate. They invade the body of a human or an animal and bind with the host’s cells to allow their own genetic material (RNA) to enter the cells. The host’s own cells read the genetic code and replicate it, making more of the virus.
That new virus then leaves the cell in search of another host to infect.
Sometimes when that genetic code is being translated into proteins, a piece of the code gets changed. This is called a mutation, and they happen frequently.
“Human cells are DNA-based. And DNA – thankfully for us – has much better integrity than RNA. DNA has the ability to check itself. If there are small changes, or what we call mutations, to its genetic code, it can fix itself and get back to normal. RNA is a lot more messy,” Dr. Kasper said.
“This perpetual cycle goes on of constant replication. Each time a replication occurs, there is a small chance that code could change. When you have this go over a huge population over time, the odds start to favor that the virus will adjust. It’s evolution on a very, very rapid level.”
A virus lives in the host who is vaccinated. That is the point of the OP.
Here is what we know.
- Based on evidence from clinical trials, the Pfizer-BioNTech vaccine was 95% effective at preventing laboratory-confirmed COVID-19 illness in people without evidence of previous infection.