Why India doesn t need a nationwide lockdown
We used a novel method to analyse daily numbers of new cases. This shows deceleration of the second wave started on April 12.
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Nurses of a Covid hospital offer prayer to mark International Nurses Day, which commemorates the birthday of Florence Nightingale, in Kolkata. (Photo | PTI)
The dynamics of epidemics can be likened to basic principles of physics, because the host-virus interaction has its physical attributes. In physics, momentum is defined as mass X velocity. In an epidemic, the number of active cases at a given point in time is like mass. The velocity is the speed of spread. The momentum of the epidemic is therefore the number of active cases X speed of spread momentum may accelerate or decelerate.