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Introduction: The trajectory of disease outbreaks has been characterized through second order differential equations.Objective: To develop a universal methodology to predict the velocity of COVID-19 pandemic in the United States, Spain, Belgium, and Austria based on differential equations and ranges of the number infected.Methodology: Seven comparison ranges were established to analyze discrete values of COVID-19 total cases. Then, right-angled triangles where their base represented the numberdoi:10.21203/rs.3.rs-39103/v1 fatcat:hkhnovjysrcz3bo3kjnke3p3ce