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Gibbs energy of growth of coronaviruses through time. SARS-CoV is represented by the blue triangle (▲), while MERS-CoV is represented by the green square (■). Data for SARS-CoV-2 are represented by orange circles (●). The orange dashed line (—————) represents a line fitted through the SARS-CoV-2 data. Between the SARS-CoV epidemic, MERS-CoV epidemic and SARS-CoV-2 pandemic, time has passed, which was not presented in the graph for better clarity.
