Generally speaking, the larger circle size or font dimension implies greater productivity or citations. In VOSviewer, the network visualization reveals concepts on the basis of their importance. Since it is recognized as an effective way to assess scientific progress when bibliometrics is combined with visualized mapping, VOSviewer, which was developed by Nees Jan van Eck and Ludo Waltman, was taken into consideration. In this study, Microsoft Excel 2016 was utilized for bibliometric analysis, and VOSviewer version 1.6.17 was employed for visualization. The research focuses moved from safety, effectiveness, and immunology at the early stage to the optimal allocation strategies for COVID-19 vaccine, and eventually to public attitudes and acceptance towards COVID-19 vaccination. In conclusion, this study shows the approximate research trend for COVID-19 vaccine during the completely first two years of the pandemic. Ultimately, COVID-19, vaccine, and SARS-CoV-2 were the top 3 keywords. Furthermore, the most popular research areas were immunology and medicine (general and internal).
Moreover, the prominent authors, institutions, and countries inclined towards regional cooperation instead of international cooperation. After analyzing a total of 17,392 publications, the results show that the overall research trend was upward. Finally, Microsoft Excel is used for bibliometric analysis to analyze publication date, author, affiliation, country, publication title, publisher, research area, document type, and language, and visualized software (VOSviewer) is used to visualize author, affiliation, country, and keywords. Subsequently, some publications published before December 2019 were removed since COVID-19 did not occur before that date. Initially, all eligible publications were downloaded from Web of Science on 1 January 2022. Hence, this study aims at using bibliometric analysis and visualization to document research trends regarding COVID-19 vaccines, and offer some directions and suggestions for future research. In accordance with former experience, an efficacious vaccine is the most effective way to curb the pandemic thus, many researchers have published related publications in the short term. Due to COVID-19, people’s lives have changed greatly.
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