page = covid-19 : npr

url = https://www.npr.org/tags/804916759/covid-19 analysed @ 2021-04-28 22:09 UTC

To understand vaccine-induced immunity more fully, researchers are comparing antibody levels in people who received the Moderna vaccine but still got COVID-19 with levels in people who got the vaccine but didn't fall ill. Angela Weiss/AFP via Getty Images hide caption
April 28, 2021 • Researchers are trying to come up with tests that can be performed using a blood sample that will determine not only whether a COVID-19 vaccine will work but also for how long.