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作者等于1979年11月,在泰国东北部距柬埔塞50km处,一个已知高度抗氯喹的恶性疟地区,收治了52例恶性疟患者,单用
The author is equal to November 1979, in a district of falciparum malaria known to have a high resistance to chloroquine at a distance of 50km from northeastern Thailand to Cambodia, and 52 patients were treated for falciparum malaria