I’m not an epidemiologist so I want to caution that this is just arm-chairing....but
For the first week after Davidson county reached its 10th case, the county followed a near-perfect doubling every 3 days trajectory - which by my modeling would be consistent with an R0 of 3.6 (assuming the average person is contagious for 12 days). However, about 9 days after that 10th case, the rate of growth changed to a trajectory of doubling more like every 7 days or so - or an R0 of 1.6. The date where the infections were occurring that led to that trajectory changed was (assuming testing occurs as patients become symptomatic, 5 days of median incubation time, and 3-5 days for test results to come back) roughly somewhere around 3/13/20-3/15/20. Interestingly this was when the SEC tournament was canceled and Broadway was closed. Is it possible that people began taking this much more seriously as that happened? I think so and find it interesting.
Had Davidson county maintained the trajectory it had been on initially Davidson county would not be at over 5000 cases. Instead yesterday it was at more like 400.
So while the response may seem disproportionate to the events there, so believe the events are being mitigated by the response.
I don’t know how wrong it is - but my modeling suggests we should have around 3-4 deaths in Davidson county now. Had we not changed trajectory that would be at 20-30 in my model. And while that still isn’t *that many* it would continue going up from there.
These models are incredibly tricky and the really tough part is that the deaths are too high for the cases we have given what we think we know about the mortality of the virus. This implies that the asymptomatic carrier population might be even higher than we think (in my model I have to increase it to one asymptomatic carrier for every symptomatic carrier to get the results to start making sense). So I offer that disclaimer given that large uncertainty.