Over time, such knowledge could also help determine how long protection from the vaccines lasts. Covid-19 vaccines are designed to work by inducing a person's immune system to produce antibody proteins that can neutralize the coronavirus. They plan to conduct similar analyses for other Covid-19 vaccines from J&J, AstraZeneca PLC and Novavax, which are being tested in trials run by the researchers' network. Pfizer and BioNTech are conducting their own analysis to determine the correlate of protection for their Covid-19 vaccine. There were relatively few cases of symptomatic Covid-19 in people who received the Moderna and Pfizer vaccines in the large studies at the time they were authorized, making statistically significant comparisons difficult.

Source: Bangkok Post February 12, 2021 23:26 UTC