Fig. 2. Lag correlations between Google Trends search-interest of the terms “COVID,” “COVID heart,” “COVID pneumonia,” and others, and the daily new cases and deaths of COVID-19 in the USA, March 1 to April 8, 2020.
(a, c) The search terms with the highest Pearson’s correlation coefficients for daily new cases and new deaths, respectively; (b, d) The rest of the search terms.