Terms and Synonyms Searched:
| Terms | Search Results* | Entire Database** |
|---|---|---|
| Synonyms | ||
| vaccine, phase 4 | -- | 0 studies |
| phase 4 | 80 studies | 29,443 studies |
| phase iv | 19 studies | 1,707 studies |
| fourth phase | -- | 7 studies |
| phase four | -- | 13 studies |
| phase | 182 studies | 198,079 studies |
| Stage | 12 studies | 30,957 studies |
| Phased | -- | 182 studies |
| vaccine | 182 studies | 11,037 studies |
| Vaccination | 144 studies | 6,860 studies |
| Immunization | 46 studies | 2,291 studies |
| inoculations | 1 studies | 282 studies |
| VACCIN | 1 studies | 46 studies |
| Covid19 | 182 studies | 7,091 studies |
| COVID | 182 studies | 7,044 studies |
| SARS-CoV-2 | 112 studies | 2,325 studies |
| Coronavirus disease 2019 | 10 studies | 318 studies |
| Severe Acute Respiratory Syndrome Coronavirus 2 | 9 studies | 225 studies |
| Novel Coronavirus | 5 studies | 152 studies |
| 2019-nCoV | 2 studies | 54 studies |
| Coronavirus Disease 19 | 1 studies | 44 studies |
| SARS Coronavirus 2 | -- | 17 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 |