Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| vaccine, phase 4 | -- | 0 studies |
| phase 4 | 44 studies | 30,122 studies |
| phase iv | 14 studies | 1,749 studies |
| fourth phase | -- | 8 studies |
| phase four | -- | 12 studies |
| phase | 66 studies | 205,060 studies |
| Stage | 2 studies | 32,437 studies |
| Phased | -- | 191 studies |
| vaccine | 66 studies | 11,622 studies |
| Vaccination | 53 studies | 7,268 studies |
| Immunization | 37 studies | 2,398 studies |
| inoculations | -- | 298 studies |
| VACCIN | -- | 48 studies |
| inactivated | 66 studies | 1,475 studies |
| Covid19 | 66 studies | 8,016 studies |
| COVID | 66 studies | 7,962 studies |
| SARS-CoV-2 | 33 studies | 2,626 studies |
| Severe Acute Respiratory Syndrome Coronavirus 2 | 1 studies | 246 studies |
| 2019-nCoV | -- | 62 studies |
| Coronavirus Disease 19 | -- | 52 studies |
| Coronavirus disease 2019 | -- | 357 studies |
| Novel Coronavirus | -- | 163 studies |
| SARS Coronavirus 2 | -- | 20 studies |
| Wuhan Coronavirus | -- | 1 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 |