2523 to study immunity against Shi Kun Kun drugs village in Prachinburi. The study of 638 people (out of 1,023 patients) of these patients pain fever mosquito (using criteria HI titer> 1:20) percent. 24.60 after the year 2520 to 2521 onwards, the infection began to decrease until no longer reported in the year 2524 to 2525 until the year 2531 to 2538 and started their report. outbreak of such province. MF 2531 to 2534 in Khon Kaen, Surin 2536, the Phayao and 2538 found that three provinces including Bangkok and Nong Khai.
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