One couple, two coronavirus cases and wildly different symptoms

I'd like to know more about their medical histories - past illnesses and what vaccines each have have had in the past. As well more info regarding their thymus involution and t-cell production. I have a theory that thymic output is at the root of the covid-19 infection. This is based on age and underlying health conditions of those experiencing critical health issues. As well Chloroquine promotes Interleukin-17 (IL-17) production. IL-17 family cytokines play an important protective role in host immune response to a variety of infections such as bacterial, fungal, parasitic, and viral. Guessing T-cell or IL-17 production is compromised in those that get sick.