Figure 3. The Relationship between Gross Domestic Product (GDP) per Capita and the Time Lag between the First Informal Report of a Suspected Case of H1N1 Influenza and a Confirmed Case in Each Country.
Only countries in which the first report of a suspected case of infection occurred before or on the same day as the first confirmed case report were included in the analysis. Thus, several countries, including the United States, were excluded.