Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| vaccine, phase 4 | -- | 0 studies |
| phase 4 | 97 studies | 30,268 studies |
| phase iv | 23 studies | 1,756 studies |
| fourth phase | -- | 8 studies |
| phase four | -- | 12 studies |
| phase | 248 studies | 206,535 studies |
| Stage | 13 studies | 32,743 studies |
| Phased | -- | 191 studies |
| vaccine | 248 studies | 10,418 studies |
| Covid19 | 248 studies | 7,991 studies |
| SARS-CoV-2 infection | 30 studies | 664 studies |
| Coronavirus disease 2019 | 11 studies | 361 studies |
| Coronavirus Disease 19 | 1 studies | 53 studies |
| SARS-CoV-2 Disease | 1 studies | 13 studies |
| 2019 nCoV Disease | -- | 6 studies |
| 2019 nCoV Infection | -- | 10 studies |
| 2019 Novel Coronavirus Disease | -- | 19 studies |
| 2019 Novel Coronavirus Infection | -- | 15 studies |
| coronavirus 2019-nCoV | -- | 1 studies |
| Disease caused by 2019-nCoV | -- | 1 studies |
| Disease caused by SARS-CoV-2 | -- | 4 studies |
| SARS Coronavirus 2 Infection | -- | 5 studies |
| Severe Acute Respiratory Syndrome Coronavirus 2 Infection | -- | 7 studies |
| -- | No studies found |
| * | Number of studies in the search results containing the term or synonym |
| ** | Number of studies in the entire database containing the term or synonym |