The United States will accept vaccines authorized by U.S. regulators or listed
for emergency use by the World Health Organization, according to the C.D.C. This
includes Moderna, Johnson & Johnson, Pfizer-BioNTech,
two versions of the Oxford-AstraZeneca vaccine, Sinopharm and Sinovac. Russia’s Sputnik V vaccine is not currently on the accepted list, meaning that most Russians and others inoculated with Sputnik V may be prohibited from entering the United States.
People are considered fully vaccinated two weeks after their second dose of a Pfizer or Moderna vaccine, or two weeks after a single-dose vaccine, such as the Johnson & Johnson vaccine, a spokeswoman for the C.D.C. said.
It is not yet clear how the United States will handle “mix and match” vaccines, an inoculation strategy common in Canada, involving a first dose of one vaccine and a second dose of a different vaccine. The World Health Organization has not yet included this approach on its approved list because “there is currently limited data on the efficacy of a ‘mix and match’ regimen,” a representative said. Over the weekend, Canadian authorities
said that they are working with the United States to include people who have been vaccinated this way on the accepted list.
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