"but Delta is an unknown" right in the title of your link! Are you unaware that there was a sea change in thinking around transmission and the Delta variant wit

"but Delta is an unknown" right in the title of your link! Are you unaware that there was a sea change in thinking around transmission and the Delta variant within a week after this Nature article was published? Also, household studies do not have adequate controls as there may be a significant number of confounding variables at play. Here's a CDC study of a prison outbreak which found a 93% attack rate for unvaccinated and 89% for prisoners vaccinated more than 4 months prior: https://www.cdc.gov/mmwr/volumes/70/wr/mm7038e3.htm https://www.cdc.gov/mmwr/volumes/70/wr/mm7038e3.htm "No one cares about transmission" until the point they want to make the case for mandates, because it collapses if one acknowledges that the vaccines are not very effective in reducing it.