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Vaccines May Work Better if Arms Are Alternated for Each Shot

February 6, 2024


When getting vaccines, switching arms for each dose may produce greater immunity than having the jabs delivered into the same arm.

That’s the finding from a new study that looked at the first two doses of COVID vaccines. Those who alternated arms showed a small increase in immunity over those who got both shots in the same arm.

Even a small boost could be significant for folks who respond poorly to vaccines, the researchers noted.

While the findings might no longer matter much for COVID vaccines, since millions of Americans got multiple shots during the pandemic, they could have implications for all multi-dose vaccines, including childhood immunizations, the researchers said.