The discovery of SARS-CoV-2, the responsible virus for the Covid-19 epidemic, has sparked a global health concern with many countries affected. Developing models that can interpret the epidemic and give common trend parameters are useful for prediction purposes by other countries that are at an earlier phase of the epidemic; it is also useful for future planning against viral respiratory diseases. One model is developed to interpret the fast-growth phase of the epidemic and another model for the full interpretation during the fast-, slow- and plateau phases . Both models are shown to agree reasonably with the data. It is shown  that during the fast phase, the number of new infected cases in several countries depends on the total number of cases by a power-law relation with a scaling exponent equal to 0.82. During this phase, the duplication time is 1-3 days. The duplication time together with another parameter that controls the phase change from the fast phase to the slow and plateau phases, varying in the range of 0.1-0.5 , may be used for data interpretation and for guiding predictions regarding this disease, e.g. the onset of the maximum in the number of new cases.
The discovery of SARS-CoV-2, the responsible virus for the Covid-19 epidemic, has sparked a global health concern with many countries affected. Developing models that can interpret the epidemic and give common trend parameters are useful for prediction purposes by other countries that are at an earlier phase of the epidemic; it is also useful for future planning against viral respiratory diseases. One model is developed to interpret the fast-growth phase of the epidemic and another model for an interpretation of the entire data set . Both models agree reasonably with the data. It is shown by the first model that during the fast phase, the number of new infected cases depends on the total number of cases by a power-law relation with a scaling exponent equal to 0.82. The second model gives a duplication time in the range 1 to 3 days early in the start of the epidemic, and another parameter alpha = 0.1-0.5 ) that deviates the progress of the epidemic from an exponential growth. Our models may be used for data interpretation and for guiding predictions regarding this disease, e.g. the onset of the maximum in the number of new cases.
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the full interpretation during the fast-, slow- and plateau phases
an interpretation of the entire data set
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are shown to
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by the first model
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in several countries
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During this phase, the duplication time is 1-3 days. The duplication time together with another parameter that controls the phase change from the fast phase to the slow and plateau phases, varying in the range of
The second model gives a duplication time in the range 1 to 3 days early in the start of the epidemic, and another parameter alpha =
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) that deviates the progress of the epidemic from an exponential growth. Our models