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Fig. 5 | BMC Public Health

Fig. 5

From: Epidemiology and timing of seasonal influenza epidemics in the Asia-Pacific region, 2010–2017: implications for influenza vaccination programs

Fig. 5

Relationship between the timing and amplitude of the primary peak (left panel) and the secondary peak (right panel) of influenza in each country between 2010 and 2017 and the latitude of the country centroid. The annual, semi-annual, and quarterly harmonics obtained from Fourier decomposition were summed to generate a periodic annual function describing the peak of activity and intensity of the seasonality. Latitude of each country centroid were from the US Central Intelligence Agency World Fact Book [15]. The size of each spot is in proportion to the amplitude for the country. Abbreviations: AUS = Australia, BGD = Bangladesh, CHN=China, IDN=Indonesia, IND = India, IRN=Iran, JPN = Japan, KHM = Cambodia, KOR = South Korea, LAO = Laos, LKA = Sri Lanka, MNG = Mongolia, NPL = Nepal, NZL = New Zealand, PAK=Pakistan, PHL = Philippines, SGP=Singapore, THA = Thailand, VNM = Vietnam

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