患儿，7岁。5天前开始发热，咳嗽，近2日尿少、水肿。体检：T37.80C，眼睑及下肢水肿，咽部充血，血压12/8kPa(90/60mmHg),心、肺正常，尿常规：蛋白（++),红细胞5-8个/HP,各项血化验暂未出结果。化验提示：抗“0”500U,CH50、C3减少，诊断为急性肾炎，应用青霉素的疗程是

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