Analysis of Influenza Cases and Seasonal Index in Thailand
This study investigated the pattern and seasonal index of influenza cases in Thailand. Our results showed that southern Thailand had the highest influenza incidence of the four regions of Thailand (i.e. north, northeast, central and southern Thailand). The influenza pattern in southern Thailand was similar to north-eastern Thailand. Seasonal index values of influenza cases in Thailand were higher in the hot season than in the wet season. Influenza cases started to increase at the beginning of the hot season (April), reached its maximum in August, rapidly declined in the middle of the wet season and reached the lowest point in December. The seasonal index value of northern Thailand differed from other regions of Thailand.
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