One Arm or Two? How You Get Vaccinated May Make a Difference

If you’ve presented the same arm for every dose of a particular vaccine, you may want to reconsider. Alternating arms may produce a more powerful immune response, a new study suggests. The researchers studied responses to the first two doses of COVID-19 vaccines. Those who alternated arms showed a small increase in immunity over those who got both doses in the same arm. For individuals who respond poorly to vaccines because of age or health conditions, even a small boost may turn out to be signi

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