People can choose which arm they’d like to use for COVID vaccine doses — and now a new study suggests one arm may have a better immune-boosting effect than the other.
The research, which was recently published in the journal EBioMedicine, shows that people who used the same arm for the primary vaccination and the booster (which is called ipsilateral vaccination) had a better immune response than those who switched arms (contralateral vaccination).
Immunology scientists from Saarland University in Germany analyzed data from 303 people who received the Pfizer-BioNTech COVID vaccine, none of which had tested positive for the virus before getting vaccinated.
