[Svartalfiar]

Pretty easy to explain: someone brought it home.

"Someone brought it home" to 66% of their total positive cases? If it's that easy for one person going out to get it and bring it home, how come more people out and about didn't catch it? Assuming an average family of four, and everyone got it, that means ~22% of the total were the family member going out, catching it, and bringing it back home. And if 20% of the total (which is low) were these in nursing homes, that means we have -8% of the total remaining as those who caught it just going to work or being out, and not bringing it back to their families, who also probably weren't staying completely locked down.

[palmer]

66% of their total positive cases? If it's that easy for one person going out to get it and bring it home, how come more people out and about didn't catch it?

No, the statistic is 66% of hospitalizations. If the people were randomly selected then we would expect more people who went out to get hospitalized. But obviously they are not random, the people who stay home are more likely to be unable to go out because they are not healthy to begin with.

As for how come more didn't catch it? They did. 25% of New Yorkers (city) have antibodies. Lots of people there caught it and didn't know it.