Monitoring and Tracking the Evolution of a Viral Epidemic Through Nonlinear Kalman Filtering: Application to the COVID-19 Case.

At the time of writing, an increasing trend in is observed, which means that the pandemic is still uncontrolled in this country and that a second wave cannot be discarded. • As far as Brazil is concerned, the most noticeable difference when compared to other countries lies in the almost periodic oscillations of , the period being of about a week, which is probably due to the poor quality of the reported data.

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