They've been tested now in about 75,000 patients in total, and the incidence of adverse effects is very, very low.
The second dose can be given three to eight weeks after the first dose.
Once your cells display the S proteins on their surfaces, your immune system responds by creating antibodies and defensive white blood cells.
Centers for Disease Control and Prevention.
If you're concerned, in the U.
Most side effects go away in a few days.