Also Read: Wearing masks did 'little to nothing' to help curb Covid spread, study reveals However, researchers caution that their findings should not discourage vaccination because it is the most secure method of obtaining protection.
They suggested people should recognise the natural immunity in individuals who have recently been infected with COVID-19. "Vaccines continue to be important for everyone in order to protect high-risk populations such as those who are over 60 years of age and those with comorbidities," the Institute for Health Metrics and Evaluation (IHME) co-author Dr.
Caroline Stein said. The relevance of a study or report to infection immunity from COVID-19 was evaluated based on the title and abstract.
In that case, the main text and any supporting materials were evaluated by two separate reviewers to see if they satisfied the inclusion requirements. Also Read: Family's financial security becomes 'top life goal' post- Covid pandemic: Survey The protection from re-infection against symptomatic disease was 82% or greater for ancestral, alpha, beta, and delta variants, and was again substantially reduced for the omicron BA.1 variant (pooled estimate of 44%.