| web | https://www.cnn.com/2021/07/30/health/breakthrough-infection-masks-cdc-provincetown-study/index.html |
| author | Michael Nedelman |
| publication | CNN |
| date | 2021-07-30 |
| web | Catherine M. Brown, DVM; Johan... | CDC | 2021-07-30 | |
| web | Catherine M. Brown, DVM; Johan... | CDC | 2021-07-30 |
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