The Global Interest in Vaccines and Its Prediction and Perspectives in the Era of COVID-19. Real-Time Surveillance Using Google Trends.

Figure 1 b shows a pronounced trend only for the “covid” sample, while the “bcg” trend stays practically unchanged with no seasonality with only a single major cycle at the end of March 2020.

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In Figure 1 a an increasing trend for both “flu” and “covid” data samples can be noticed; with the “flu” time series affected by seasonal factors (with yearly peaks between October and December), cycles were not detected.

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