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Objective: Continuous monitoring of COVID-19 vaccines safety may provide  additional information to health care professionals and the general population.  The aim of the present study was to analyze the local and systemic adverse  events following the administration of the Spikevax® (Moderna) vaccine, and  to identify the factors related to greater reactogenicity., Method: Using a telephone survey, we interviewed 331 recipient of the  Spikevax® vaccine (50.2% men; Meanage = 46.4). Participants  haracteristics, prior COVID-19 infection and local and systemic adverse events  within seven days following the first and second vaccine doses were asked. Results: Injection site pain, fatigue and headache were the most common adverse events. The prevalence and intensity of local events was higher after the first dose, while systemic events were higher in the  second one. Most adverse events were mild/moderate; 1.2% of participants  needed hospitalization or emergency room visit. Women and participants aged  18-55 years were more likely to experience greater reactogenicity, participants  with prior COVID-19 infection had more systemic  events after the first dose, and participants with chronic diseases other than  hypertension reported fewer systemic adverse events following the second  dose., Conclusions: Our results are consistent with previous studies, identifying women, people aged 18-55 years and those with previous COVID- 19 infection as those who experienced the greatest reactogenicity to the  vaccine. A relationship was also found between reactogenicity and suffering from a chronic disease other than hypertension., (Copyright AULA MEDICA EDICIONES 2014. Published by AULA MEDICA. All rights reserved.)

Objective: To analyze the local and systemic reactions that appeared after the first and second dose of the BNT162b2 vaccine against COVID‑19 (Pfizer- BioNTech) in a sample of workers from a tertiary hospital, and to identify the  factors related to greater vaccine reactogenicity., Method: A self-administered questionnaire was used to interview 291 workers  from a tertiary hospital who received the BNT162b2 vaccine against COVID-19  between January and March 2021. The questionnaire included questions about  the sociodemographic variables of the participants, previous COVID-19  infection, and local and systemic reactions after the first and second dose of  the vaccine., Results: The most common adverse reaction was soreness at the injection site, which was reported more frequently after the first dose of the  vaccine. The systemic reactions evaluated were reported more frequently after the second dose of the vaccine. Women, younger adults, and  subjects with a prior COVID-19 infection reported increased reactogenicity. Furthermore, high reactogenicity after the first dose was found  to be related to a higher number of adverse reactions after the second dose of  the vaccine., Conclusions: The distribution of reactogenicity in the present study is consistent with the data reported in previous studies on the BNT162b2 vaccine, especially in terms of its association with the participants'  characteristics. These findings could facilitate the identification of people at a  higher risk of developing high reactogenicity to the vaccine, thereby making it  possible to anticipate the appearance of adverse reactions and plan for their  treatment., (Copyright AULA MEDICA EDICIONES 2014. Published by AULA MEDICA. All rights reserved.)