After a previous BA.1 infection, Omicron BA.4/5 infection is more likely than BA.2

In a recent study published in the journal Eurosurveillance, researchers investigated whether prior severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and/or coronavirus disease 2019 (COVID-19) vaccination protected against SARS-CoV-2 Omicron variant of concern (VOC) BA.4/5 sub-VOC or BA.2 sub-VOC infections.