I do think that on a personal level, it was probably just more hand washing, the masks to prevent droplets and so on (that is, both groups could have done so, b

I do think that on a personal level, it was probably just more hand washing, the masks to prevent droplets and so on (that is, both groups could have done so, but the infectious disease experts are more likely to do so with every interaction). However, one part of your comment stood out to me: the infectious disease units also have higher HVAC standards than say regular areas (e.g., https://www.hfmmagazine.com/articles/3246-studying-airflow-in-the-or https://www.hfmmagazine.com/articles/3246-studying-airflow-i...).