In this research work, a non-linear dynamical modified SEIR model of the recent pandemic, due to Coronavirus-19 disease (COVID-19) for different countries like Malaysia and Pakistan, is considered under nonsingular fractional order derivative. For this model, some qualitative results, existence theory, and numerical solution are studied by using fixed point approach and fractional Adams-Bashforth method. The results are simulated corresponding to some real data of various fractional order by using Matlab. Hence, the suitability of the considered COVID-19 model for the current outbreak in two different countries Malaysia and Pakistan are shown by simulation.

在这项研究工作中，在非奇异分数阶导数下，考虑了由于马来西亚和巴基斯坦等不同国家的冠状病毒-19病（COVID-19）导致的近期大流行的非线性动力学修正SEIR模型。对于该模型，使用定点方法和分数阶Adams-Bashforth方法研究了一些定性结果，存在理论和数值解。使用Matlab对结果进行了模拟，得到了与各个分数阶的一些实际数据相对应的结果。因此，通过仿真显示了考虑的COVID-19模型对马来西亚和巴基斯坦这两个不同国家当前暴发的适用性。