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Background: Vaccine hesitancy is a phenomenon that can interfere with the expansion of vaccination coverage and is positioned as one of the top 10 global health threats. Previous studies have explored factors that affect vaccine hesitancy, how it behaves in different locations, and the profile of individuals in which it is most present. However, few studies have analyzed the volatility of vaccine hesitancy., Objective: Identify the volatility of vaccine hesitancy manifested in social media., Methods: Twitter's academic application programming interface was used to retrieve all tweets in Brazilian Portuguese mentioning the COVID-19 vaccine in 3 months (October 2020, June 2021, and October 2021), retrieving 1,048,576 tweets. A sentiment analysis was performed using the Orange software with the lexicon Multilingual sentiment in Portuguese., Results: The feelings associated with vaccine hesitancy were volatile within 1 month, as well as throughout the vaccination process, being positioned as a resilient phenomenon. The themes that nurture vaccine hesitancy change dynamically and swiftly and are often associated with other topics that are also affecting society., Conclusion: People that manifest the vaccine hesitancy present arguments that vary in a short period of time, what demand that government strategies to mitigate vaccine hesitancy effects be agile and counteract the expressed fear, by presenting scientific arguments., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Machado Júnior, Mantovani, de Sandes-Guimarães, Romeiro, Furlaneto and Bazanini.)

Background: The COVID-19 pandemic primarily impacted long-term care facilities by restricting visiting and circulation of visitors, affecting the quality of life (QoL) of older adults living in these institutions. Volunteer activities, essential for older adults' daily life, were also interrupted and potentially negatively impacted the QoL of older adults, volunteers themselves, and also employees in these institutions. In this context, this study aims to evaluate the impact of the return of volunteer-led activities in a long-term care institution on the QoL of older adult residents, employees, and volunteers., Methods: This study used a pre-test and post-test design within the same group. The first round of data collection was conducted before volunteer-led activities returned and the second round after 1 month of return. The instrument used to assess QoL was the EUROHIS-QoL-8 scale. This study was conducted within a nursing home in São Paulo, Brazil, created in 1937 by members of the Israeli community living in Brazil. Volunteer-led activities were part of residents' daily life before the COVID-19 pandemic, when these activities were interrupted for about 20 months. A total of 79 individuals participated in both rounds (pre and post), of which: 29 residents, 27 volunteers, and 23 employees of the long-term care institution., Results: Using a Wilcoxon signed-rank test, the analyses indicated improvements after the 1 month return in different QoL aspects for the three groups. Volunteers improved their personal relationships (Z - 2.332, p < .05), residents their overall health (Z - 2.409, p < .05) and employees in their overall QoL perception (Z - 2.714, p < .05). Influencing factors for residents were the number of activities (3 or more), gender (male), and education (undergraduate/graduate). For employees, those who assumed additional activities due to the volunteer-led activities interruption had a significant impact on their overall QoL., Conclusions: Evidence from this study suggests that volunteers' return positively impacted different QoL aspects for volunteers, residents, and employees., (© 2023. The Author(s).)