U.S. authorities warned that Covid-19 vaccination efficacy was decreasing over time. They had authorized booster shots for all Americans from September 20, starting eight months after an individual has been fully vaccinated.
WHO experts insisted that the science was still out on boosters and stressed that ensuring that people in low-income countries received jabs, where vaccination is lagging, was far more critical.
WHO called earlier this month for a moratorium on Covid vaccine booster shots to help ease the drastic inequity in dose distribution between rich and poor nations.
Washington had already authorized an extra dose for people with weakened immune systems.
Israel has also begun administering third doses to Israelis aged 50 and over.
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