Our stated strategy is to take “social distancing” measures to as to “flatten the curve” (that is, to delay when the peak occurs and to make the peak lower than our health system capacity.
Evidence from past outbreaks of other pandemics.
How to effect social distancing.
However, the UK is taking a somewhat different approach. While they are attempting to shield the most vulnerable, they are actually hoping enough people get it to establish “herd immunity” (60 percent getting it)
They’ll institute more stringent isolation measures in time (so they hope) to NOT overwhelm their health care system. But they want to avoid a “second peak” when the measures go away..which Japan might be experiencing right now:
March 12. We were supposed to be traveling to Britain next week to look around universities with Molly, but this is not the best time to travel. Vacation canceled. At least the hotels are all refundable.
March 13. On hold to Expedia for three hours to cancel flights — the line goes dead. Repeat two more times. I try calling All Nippon Airlines. On hold for one hour — success. Flight fully refunded.
March 15. The sun is shining and people are outside. Chinatown is as busy as I have seen it in two months. The chestnut seller and fortune tellers are back. It feels good. Until I consult the NHK website: Japan just set a record daily high in new infections, with 63 fresh cases.
Are people relaxing too soon?
The mathematics of the model:
And the standard “SIR” (Susceptible, Infected, Recovered) model.