The U.S. will offer booster shots starting in September as experts cite waning immunity against COVID-19 infection.
The booster shots would be given to those who have been inoculated with two-dose vaccines. Initially, it will be offered to healthcare workers, nursing home residents, and older people. The plan calls for an extra dose eight months after the second shot of the Pfizer or Moderna vaccine.
Recent reports suggested that the vaccine efficacy has reduced owing to the strength of the Delta variant. U.S. officials say that the booster dose recommendation is made after a thorough review of the evidence. However, some experts disagree with the plan, saying that there is not enough data indicating reduced vaccine effectiveness. WHO's guidance also says that the current data does not indicate the need for booster shots.