Exploiting the SIQR model for COVID-19, I show that the wavy infection curve in Japan is the result of fluctuation of policy on isolation measure imposed by the government and obeyed by citizens , Assuming the infection coefficient be a 2-valued function of the number of infected individuals , I show that when the removal rate of infected individuals is between these two values, the wavy infection curve is URLanized. On the basis of the infection curve, I classify the outbreak of COVID-19 in each country into five types and show that these differences can be related to the relative magnitude of the transmission coefficient and the quarantine rate of infected individuals.
Exploiting the SIQR model for COVID-19, I show that the wavy infection curve in Japan is the result of fluctuation of policy on isolation measure imposed by the government and obeyed by citizens . Assuming the infection coefficient be a two-valued function of the number of daily confirmed new cases , I show that when the removal rate of infected individuals is between these two values, the wavy infection curve is URLanized. On the basis of the infection curve, I classify the outbreak of COVID-19 into five types and show that these differences can be related to the relative magnitude of the transmission coefficient and the quarantine rate of infected individuals.
R
,
.
R
2-valued
two-valued
R
infected individuals
daily confirmed new cases
D
in each country