The data is still accumulating. Some studies have shown that even with one dose there is a reduction in transmission to others. It won't be 100%, nor would it be that even with two doses. I think the data is trending in a very positive direction.
I would just clarify. Of course, if you prevent infection, whether symptomatic or asymptomatic, you will reduce transmission. That's one thing. Those vaccines, even after one dose, have had a very high vaccine effectiveness, particularly against serious outcomes. That's very positive.
One study, for example, from the United Kingdom, demonstrated a 50% to 60% or so reduction in transmission. Overall, even with one dose we expect to see that effect.