In rich countries, the momentum is growing for giving additional doses to the fully vaccinated, though many experts say the focus should be on getting first doses to people around the world.
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Many who received the shot may need to consider boosters, the authors said. But federal health officials do not recommend second doses.
Data from overseas, particularly Britain, suggest the spread of the virus will set vaccinated and unvaccinated communities on very different paths.
The move comes after more than 600 medical employees who had received two doses of the Sinovac vaccine became infected.
Scientists were critical of the announcement, pointing to evidence that the current two-dose regimen is powerfully effective against the coronavirus.
With the Delta variant spreading, Prime Minister Scott Morrison is making the AstraZeneca vaccine available to younger people who want it. Some state officials say it’s the wrong call.
New scientific research underscores the effectiveness of vaccines and their versatility in the fight against the coronavirus.
Administering a first dose of one vaccine and a second dose of the other, in either order, is likely to provide potent protection, the researchers said.
Several countries are allowing mix-and-match inoculation, which scientists hope will have benefits, and Chancellor Angela Merkel of Germany is among those to get it.
India’s suspension of exports has prompted regional leaders to ask for donations as outbreaks continue.