本文报告在热带地区服用“法西达”(Farsider,每周一片,每片含乙胺嘧啶25mg和SDM’500mg)预防疟疾者血清叶酸浓度的测定结果。服药组共81例,另以未使用“法西达”而2周内有腹泻或无急性肠道疾患的病例99例作为对照组,均不包括孕妇及哺乳者。全部病例除进行体检和实验室检查外, This paper reports the results of the determination of serum folate concentrations in malaria prevention patients in the tropics using Farsider (weekly, tablets containing 25 mg pyrimethamine and SDM ’500 mg). A total of 81 patients in the medication group and 99 patients who did not use “faxidazar” and had diarrhea or no acute intestinal disease within 2 weeks as the control group did not include pregnant women and lactating women. In addition to all cases of physical examination and laboratory tests,