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. 2020 Sep 30;231:157–159. doi: 10.1016/j.ahj.2020.09.005

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Relationship between internet search volume for ‘chest pain’ and new COVID-19 cases in the United States (US). A. Relative Google search volume for ‘chest pain’ and control terms ‘toothache’, ‘abdominal pain’, ‘knee pain’, ‘heart attack’ and ‘stroke’ from Jan 1, 2017 to May 24, 2020 in the United States. Blue dashed line: World Health Organization declared COVID-19 a pandemic. B. Correlation between relative search volume for ‘chest pain’ and number of new COVID-19 cases per day in the United States (Pearson correlation 0.79 with 18-day time-lag). Time period: Jan 1 to May 26, 2020. Arrow: 100th cumulative case reached in the United States.