> Each person was matched with a demographically similar partner based on characteristics such as age, race, and sex. That's a start. But where is pre-existing

> Each person was matched with a demographically similar partner based on characteristics such as age, race, and sex. That's a start. But where is pre-existing conditions, general health (e.g. BMI), or even living with family members and/or pets (i.e., a possible proxy for gut /immune system health). Without such things it could be the luck of the draw (slightly) favored one jab over the other. It would also help to know how much each company contributes to the school. How many grads are employed at each, etc. Influence is a funny and subtle thing and should not be ignored, especially given Harvard's past. True, once is not a trend. But this was a significant and influential "gaff". https://www.npr.org/sections/thetwo-way/2016/09/13/493739074/50-years-ago-sugar-industry-quietly-paid-scientists-to-point-blame-at-fat https://www.npr.org/sections/thetwo-way/2016/09/13/493739074...