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Infection risk among household contacts stratified by vaccination status, California and Colorado, January–April 2021.
| SARS-CoV-2 Positive During Investigation | Not SARS-CoV-2 Positive During Investigation | Infection Risk | |
|---|---|---|---|
| Fully Vaccinated | 6 | 20 | 23.1% |
| Partially Vaccinated | 3 | 18 | 14.3% |
| Fully and Partially Vaccinated | 9 | 38 | 19.1% |
| Recently Vaccinated | 8 | 10 | 44.4% |
| Not vaccinated | 127 | 130 | 49.4% |
| Recently and Not Vaccinated | 135 | 140 | 49.1% |
| Total | 144 | 178 | 44.7% |
