Universality and herd immunity threshold: Revisiting the SIR model for COVID-19

  title={Universality and herd immunity threshold: Revisiting the SIR model for COVID-19},
  author={Sourav Chowdhury and Suparna Roychowdhury and Indranath Chaudhuri},
  journal={International Journal of Modern Physics C},
COVID-19 pandemic has been raging all around the world for almost a year now, as of November 1, 2020. In this paper, we try to analyze the variation of the COVID-19 pandemic in different countries in the light of some modifications to the susceptible-infected-recovered (SIR) model. The SIR model was modified by taking time-dependent rate parameters. From this modified SIR model, the basic reproduction number, effective reproduction number, herd immunity, and herd immunity threshold are… Expand
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