We would like to share some ideas on the publication ‘COVID-19 vaccination coverage and vaccine hesitancy among people with opioid use disorder in Barcelona, Spain’ [1]. More than two-thirds of the sample of persons with opioid use disorder were fully vaccinated, according to Vallecillo et al., but among people with opioid use disorder on opioid agonist therapy who were referred to vaccination clinic sites, complacency and convenience were significant barriers to completing vaccination [1]. Acceptance of COVID-19 immunisation is regulated by several factors, and the pattern may vary according to the environment and outbreak level. Furthermore, as data on vaccine efficacy and safety change, adoption trends may shift dramatically [2]. And indeed, according to a recent study, acceptance patterns are shifting over time [3]. To examine the impact of vaccination willingness and associated factors, a longitudinal study rather than a cross-sectional analysis might be useful.

我们想分享一些关于出版物“西班牙巴塞罗那阿片类药物使用障碍患者的 COVID-19 疫苗接种覆盖率和疫苗犹豫”的一些想法 [1 ]。根据 Vallecillo 等人的说法，超过三分之二的阿片类药物使用障碍患者样本已完全接种疫苗，但在接受阿片类药物激动剂治疗的阿片类药物使用障碍患者中，他们被转介到疫苗接种诊所，自满和便利是重大障碍完成疫苗接种 [ 1 ]。COVID-19 免疫接种的接受度受多种因素的影响，其模式可能因环境和爆发程度而异。此外，随着疫苗功效和安全性数据的变化，采用趋势可能会发生巨大变化 [ 2]. 事实上，根据最近的一项研究，接受模式会随着时间的推移而发生变化 [ 3 ]。要检查疫苗接种意愿和相关因素的影响，纵向研究而不是横断面分析可能会有用。