  Starting with the power law for the total number of detected infections, we
propose differential equations describing the effect of momentum epidemic
management. Our 2-phase formula matches very well the curves of the total
numbers of the Covid-19 infections in many countries; the first phase is
described by Bessel functions. It provides projections for the saturation,
assuming that the management is steady. We discuss Austria, Brazil, Germany,
Japan, India, Israel, Italy, the Netherlands, Sweden, Switzerland, UK, and the
USA, including some analysis of the second waves.
