[Response to the letter to the editor of "Commentary on the COVID-19 mRNA vaccine reactogenicity study"].

Dear Editor, Our study aims to compare the short-term adverse effects and their consequences between the RNAm vaccines Commirnaty® (Pfizer) and Spikevax® (Moderna), as well as these short-term adverse effects and their consequences between the first and second doses of these vaccines with each other. Possible long-term adverse effects were not the subject of our study….

[Reactogenicity Study of mRNA Vaccines Against COVID-19].

Objective: To compare the reactogenicity between the types of mRNA Commirnaty® (Pfizer) and Spikevax® (Moderna) vaccines against COVID-19 in a healthcare population.

Methods: Cross sectional study of short-term adverse effects and their consequences (sick leave, limitations of daily life, etc.) after the administration of the first and second doses of both vaccines in professionals and students of a health institution.