Vaccines recognized by the FDA and WHO undergo rigorous testing and review to determine they’re safe and effective. And among the vaccines used internationally, experts say some likely won’t be recognized by the agencies.

Why can’t some COVID-19 vaccinated people travel to the U.S.?

Because they might not be vaccinated with shots recognized by the U.S. Food and Drug Administration or the World Health Organization, the AP explains.

When lifting overseas travel restrictions in November, the U.S. required adults coming to the country to be fully vaccinated with shots approved or authorized by the FDA or allowed by WHO.

Among the most widely used vaccines that don’t meet that criteria are Russia’s Sputnik V vaccine and China’s CanSino vaccine. Sputnik V is authorized for use in more than 70 countries while CanSino is allowed in at least nine countries. WHO still is awaiting more data about both vaccines before making a decision.

Vaccines recognized by the FDA and WHO undergo rigorous testing and review to determine they’re safe and effective. And among the vaccines used internationally, experts say some likely won’t be recognized by the agencies.

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