Switch it up: Why using different arms for vaccine doses could be a good idea

Taking a contralateral approach boosted immune response for COVID-19 vaccines, study shows.

It might be worth asking patients to switch it up for their COVID-19 vaccines, with a study showing alternating arms between doses may produce a greater immunity than giving doses ipsilaterally.

This is the conclusion reached by US researchers, who looked at antibody responses in nearly 1000 adults who received the initial two-dose regimen of Pfizer’s mRNA-based COVID-19 vaccines.