In This Video Chris explains why a Low Inoculum (small viral load) is important. If you do catch Covid-19 and the 1st dose of the virus your body receives is small, your body will have more time to learn fight the virus before it builds up to having health consequences.
Watch from 13:59.
Below is the full video, featured in the above video, from Rishi Desai.
Watch from 12:55.
Here is the Transfusion Medicine Reviews Article Chris references.