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山东为单纯间日疟流行区,一年中3月份前发病甚少,4月份开始上升,5、6月份形成上半年高峰,8、9月份出现流行季节高峰。这两个高峰发病人数约占全年总病人数的80%以上。
Shandong is a purely epidemic area of Vivax malaria. There was very little incidence in March of the year before the start of the year. It started to rise in April and peaked in the first half of the year in May and June. The epidemic peak season occurred in August and September. The incidence of these two peaks accounts for more than 80% of the total number of patients in the whole year.