| web | https://www.usatoday.com/story/news/health/2021/06/24/covid-vaccine-delta-variant-california-fda-cdc-missouri-hotspot/5329714001/ |
| author | Elinor Aspegren, N'dea Yancey-Bragg, and Steven Vargas |
| publication | USA TODAY |
| date | 2021-06-24 |
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