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Vaccine Boosters: Needed Now or Not Yet?

Vaccine Boosters: Needed Now or Not Yet?
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As new and more potent coronavirus variants emerge and reports show some vaccines declining in efficacy, countries -- mostly in the developed world -- are getting ready to provide booster shots. But many health experts say they are not needed –- at least yet –- and the World Health Organization says available vaccines should go first to the unvaccinated in less-developed countries. VOA correspondent Mariama Diallo looks into it.
Producer: Kim Weeks