[Narretz]

If it reduces impact it also reduces impact of transmission because the patient has lower viral load. Masks have to same effect, although to a lesser degree (and obviously a different mode of operation).

[M2Ys4U]

>If it reduces impact it also reduces impact of transmission because the patient has lower viral load.

That's incredibly likely but it's not what the trails tested, and so we can't rely on it.

When the vaccine has been rolled out much more widely we'll be able to gather the data to test that hypothesis using surveillance data.