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Immunity also depends on viral load. If you are hot-boxing in a tiny subcompact car for 48 hours cross country road trip with someone who is highly contagious,

Immunity also depends on viral load. If you are hot-boxing in a tiny subcompact car for 48 hours cross country road trip with someone who is highly contagious, is different than sitting in a large, indoor restaurant across the table for an hour from someone who has covid, but is mostly recovered (I still wouldn't sit with this person, but seems to happen a lot) the viral load you will receive, is a lot less than the subcompact car scenario. Your friend could be immunocompromised, or they could be "living their best life" and spending a lot of time indoors with strangers, or both. It's hard to say. There are a lot of people I know who only eat on outdoor patios, minimize time indoors with others, but end up finally getting covid for the first time when a family member comes over for sunday night dinner and infects the entire household.

logifail 4y ago
> Immunity also depends on viral load It also appears to depend on what blood types the infected and not-yet-infected people have[0] Which intrigues me greatly, because no-one in my immediate family knows their blood type. Our middle child had Covid in March (infected at his school) and promptly gave it to my wife. He spent 10 days at home as he kept testing positive, she spent almost as long. Despite the rest of us taking no precautions whatsoever within our home, the other three of us were not infected. Then our eldest child had Covid in May (over half his school class were positive around that time), and he promptly gave it to me. The (ex-)scientist in me would now like to have our blood types checked! [0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8286549/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8286549/