COVID-19 international outbreak and the need for a suitable estimation model: A second-order polynomial equation with constant coefficients based on imported infected cases seems inadequate

COVID-19 due to infections with the 2019 novel coronavirus(SARS-CoV-2)was first reported in Wuhan,Hubei Province,China in December 2019.Up to 2 March 2020,it has already spread to more than 55 countries,infected more than 85000 individuals,and yielded to about 3000 death cases[1].Due to the vigorous outbreak of COVID-19,it has become a global concern.Further management and controlling of this worldwide threat inevitably relies on the preparedness and precise risk assessment of the future,particularly in countries that new cases have been observed.In this regard,estimation of new probable confirmed and death cases in the near future is crucial to health care systems of each country.As a result,some researches have been conducted to address this new concern[2-4].