In contrast to our study, the recent work published by Eifer et al did not show a difference in [18F]-PSMA uptake in ipsilateral lymph nodes after COVID-19 vaccination.8 One possible explanation for this discrepancy may be that Eifer et al used two different radiotracers [18F]-PSMA and [68Ga]-PSMA in their study. The gene discussed is FOLH1; the disease is COVID-19.