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COVID-19, short for COronaVIrus Disease 2019, is a respiratory illness caused by a novel coronavirus first detected in China in late 2019. Early transmission of the coronavirus was linked to an animal market, suggesting animal-to-person infection. By January 2020, with the spread of coronavirus disease to over 100 other locations, including the U.S., the World Health Organization (WHO) officially declared the outbreak a public health emergency and later, a pandemic. Only months later, confirmed cases of COVID-19 have been recorded in almost every country around the world.
This model shows how the virus spreads inside the lung, how the respiratory rate and heart rate increases to compensate for the restrictive lung disease that is occuring