also still had notable levels of virus-fighting antibodies six months after the second required shot.FILE - A patient receives a COVID-19 vaccination on Feb.
27 2021 in Dover, Kent, United Kingdom. (photo by Andrew Aitchison / In Pictures via Getty Images) Antibodies also don't tell the whole story.
To fight off intruders like viruses, our immune systems also have another line of defense called B and T cells, some of which can hang around long after antibody levels dwindle.