| Abbreviations | Definition |
| CDC | Centers for Disease Control and Prevention |
| CGA | The Harvard Center for Geographic Analysis |
| COVID-19 | an infectious disease caused by the SARS-CoV-2 virus |
| FDA | U.S. Food and Drug Administration |
| HCW | Health Care Workers |
| NER | Name Entity Recognition |
| PES | Public Engagement Score: a score shows the level of public involvement for discussion of COVID-19 vaccines |
| PSS | Public Sentiment Score: a score shows the polarity of public attitude for discussion of COVID-19 vaccines |
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