Sun Ke, a study of 705 cases of children in Shenzhen, found that the number of cases of the disease in the Shenzhen region from April to June was relatively high, accounting for 29. 1% (205/705 cases), but the four seasons of morbidity is not very different, showing the characteristics of distribution, including Shenzhen locals and has come to Shenzhen to live 0. More than five years of foreign immigrants accounted for about 9 8. 7% (696/705 cases).
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