Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| vaccine, phase 4 | -- | 0 studies |
| phase 4 | 97 studies | 30,099 studies |
| phase iv | 23 studies | 1,746 studies |
| fourth phase | -- | 8 studies |
| phase four | -- | 12 studies |
| phase | 245 studies | 204,785 studies |
| Stage | 15 studies | 32,380 studies |
| Phased | -- | 191 studies |
| vaccine | 245 studies | 11,598 studies |
| Vaccination | 195 studies | 7,254 studies |
| Immunization | 59 studies | 2,393 studies |
| inoculations | 1 studies | 297 studies |
| VACCIN | 1 studies | 48 studies |
| Covid19 | 245 studies | 7,976 studies |
| COVID | 245 studies | 7,922 studies |
| SARS-CoV-2 | 149 studies | 2,616 studies |
| Severe Acute Respiratory Syndrome Coronavirus 2 | 12 studies | 244 studies |
| Coronavirus disease 2019 | 11 studies | 357 studies |
| Novel Coronavirus | 7 studies | 163 studies |
| 2019-nCoV | 3 studies | 62 studies |
| Coronavirus Disease 19 | 1 studies | 52 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 |