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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

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.

You might want to choose your recipient arm carefully before the booster programme this autumn.

People can choose which arm they use for doses of the COVID vaccine and booster — now a new study suggests a certain choice may have a better immune-boosting effect than the other.

Researchers in Germany analyzed data from more than 300 people who received the COVID-19 vaccine, along with a booster dose.