encounter the virus.
The virus can still enter the respiratory system.
The immune system may still have to fight it.
But previous vaccination can give that immune system a head start.
That head start can make an enormous difference.
Getting Infected Is Not the Same as Becoming Severely Ill
This is one of the most important distinctions in understanding COVID-19 vaccination.
There are several different outcomes after exposure to SARS-CoV-2.
One person may never develop noticeable symptoms.
Another may develop mild congestion and fatigue.
Someone else may develop fever and
