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When vaccines work they are usually great at stopping the spread. For the original strain of covid, for example, it both stopped symptoms **and** stopped the spread.
The new variants however (such as delta, the most prevalent one, and omicron) it is either completely in effective or significantly less effective (hard to draw firm conclusions off what studies we have). The point is, its not effective at stopping the spread because the spike protein it encodes for is different in the variants and thus the antibodies are ineffective to a significant degree (if not completely).
yea masks im not sure about. The data in them are questionable in either direction so we can only speculate about how or if they are effective.
I think if you are very strict in how you use them they probably help, but most people, almost no one, handles mask with the level of rigor needed for them to be effective.
ofc it is not randomised but it is hard to do that with a pandemic disease
Ok then ill have to read, my cursory glance didnt seem to see anything about face touching in their model.
Though regardless if its non-randomized observational study it still has the underlying issue of confounding and thus the post hoc ergo propter hoc fallacy. But ill give it a full read to give a more proper answer
At a cursory glance i took leakage to mean particles that escape out of the side. Not the effects of people taking off their mask and touching it and their face constantly.
