Sure, but we do have prior probabilities based on other vaccination campaigns and studies. We also have some understanding of the causal mechanism of this vacci

Sure, but we do have prior probabilities based on other vaccination campaigns and studies. We also have some understanding of the causal mechanism of this vaccine, so there is other evidence. It’s just not a direct randomized control. People fixate on statistical testing under randomized control, but there’s a lot more information out there that can be used to assess probabilities.