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A month or two back there were transmission rate graphs but, as far as I can tell, no study to back them up. Well, here are the hamster study results. Surgical masks placed on cages. Apparently they didn't look at the case where both wear masks.
| Infected | Non-Infected | Transmission Rate to Non-Infected |
| No Mask | No Mask | 66.7% |
| No Mask | Mask | About 33% |
| Mask | No Mask | 16.7% |