The Lancet Microbe has suggested.The findings hold significance as vaccination programmes are under way across the world, including in India. “The rate of antibody waning suggests re-infection may occur in subsequent waves of infection.
Also, if immunity provided via vaccinations wanes like naturally-produced antibodies, annual vaccine administration could be necessary to prevent future outbreaks of covid-19," the study done by Duke-NUS Medical School, the National Centre for Infectious Diseases (NCID) and the Agency for Science, Technology and Research (A*STAR) Infectious Diseases Labs, Singapore, said.Severity of the infection could be a deciding factor in having longer-lasting antibodies, it further said.