Fig. 2.

Relationship between chicken pox cases and information seeking. (Left) Time series of reported chicken pox cases and information-seeking behavior for chicken pox (i.e., Google Trends data) in Mexico, Thailand, Estonia, Australia, and the United States. Google data were detrended to remove long-term trends and focus on seasonal variation in information seeking. (Right) Relationship between reported cases of chicken pox and chicken pox information seeking when both were available, with applicable $R^2$ and P values. Chicken pox case data from Mexico and the United States were weekly, whereas chicken pox case data from Thailand, Australia, and Estonia were monthly.