The New England Journal of Medicine has published a small study by a team of emerging infectious disease experts led by Dr. Wang Linfa at Duke-NUS Medical School.

The study shows that people who have had severe acute respiratory syndrome(SARS) appear to have gained "super-immunity" after receiving the Covid-19 vaccine - against all mutant strains viruses currently circulating. The potent antibodies produced in these people even protect the body from other types of coronavirus infections.