To it having spread this quick in the US, I go with the CDC version unless the timeline is incorrect and was here earlier than many guess. Though I’d rarely agree with angry Ben, id say he is correct on the viral load. I think more of it has to do with how your body handles it as an individual. I travel all the time and rarely get sick. Scientifically unproven but I tend to think that if you are someone who is exposed to more crap out there while sitting in hotels, rental cars, airlines and restaurants, that maybe your immune system does better around dirty shit than the average person that goes to their 9-to-5 job and comes back to their little bubble. 🤷♂️