Quote:
Originally Posted by Mr Rick
While it is not 100% effective in stopping the spread it will greatly reduce the current R0 in NY which is at 0.81 infections per person who gets Covid. So even without contact tracing NY Covid cases would be going down.
Note that R0 (the basic reproductive rate of a virus) is essentially a 'fixed' average at the start of an epidemic (and might be 2.5 or 3 for SARS-CoV-2 in developed nations if no social distancing or protection occurs), but the
R_t number constantly changes according to local population density, human behaviour, and post-viral immunity, and can only be estimated. In NY it's definitely on the lower side now, with new cases clearly on the decline (albeit from a spectacularly high rate six weeks ago). I like
this set of R_t visualizations from the creators of Instagram (so they know a little bit about exponential growth!). They estimate the current R_t number for NY state is 0.8.
Meanwhile, they think cases in Arizona are increasing most rapidly, with an estimated R_t of 1.18. Confirmed cases there have been shooting up (I read that bars are open and busy in Scottsdale and Phoenix). Arizona is heading towards an average of 30 Covid fatalities per day fairly soon.
The situation in Nevada apparently isn't quite as dire, with an estimated R_t close to one, but cases are gradually increasing, albeit to a level about a fifth of Arizona's. Daily fatalities in NV remain at a low level, of only about four a day, which sounds to my uneducated mind as a number that the local healthcare system could "tolerate" for a while.
Alternative estimates for R_t numbers can be found at
C19Pro, along with this map, which suggests the highest R_t numbers (darker red) are in Utah, Arkansas, the Carolinas, Arizona, California, Alabama, and Florida.
I'm not sure if I said this earlier in the thread, but even if cases explode in California and Texas, nowhere is gonna be as bad as it was in NY or NJ. In terms of susceptibility to viral spread, NYC is just on a different scale to other cities, due to the population density and high use of public transport. It's a lot easier for vulnerable people to "hide" from the virus in the desert.