> Don't something like 20-25% of all New Yorkers already have antibodies? Doesn't that show the virus isn't that dangerous? The body count would be in the millions by now.
For many viral diseases the severity in a particular individual depends on how much of the virus they were exposed do. I don't believe that know yet if COVID-19 is such a disease.
For such diseases, you could have a case where a large fraction of the population is going to get it regardless of whether you continue as normal or you social distance and stay at home as much as feasible, but in the former case most get a large enough dose to get very sick or die and the the latter case most get a small enough dose to not get sick or just get mildly sick. In both cases you would have a large fraction with antibodies.
For many viral diseases the severity in a particular individual depends on how much of the virus they were exposed do. I don't believe that know yet if COVID-19 is such a disease.
For such diseases, you could have a case where a large fraction of the population is going to get it regardless of whether you continue as normal or you social distance and stay at home as much as feasible, but in the former case most get a large enough dose to get very sick or die and the the latter case most get a small enough dose to not get sick or just get mildly sick. In both cases you would have a large fraction with antibodies.