患儿，男，岁，因进行性肌无力15月，咳嗽发热心天于1997年7月12日入院。于出生三个月时无明显诱因出现四肢无力。自主运动减少，以近瑞明显，症状进行性加重。逐渐出现无力抬头，伸舌颤抖，伴吞咽困难、无消瘦及智力障碍。曾于外院诊为“脑瘫”治疗无好转，4天来发热咳嗽而入 Children, men, aged, due to progressive muscle weakness 15 months, cough and fever days admitted in July 12, 1997. There was no obvious incentive to have limb weakness at three months of birth. Autonomous exercise reduced to near apparent, the symptoms progressive increase. Gradually appear unable to look up, trembling, with swallowing difficulties, no weight loss and mental retardation. In the out-patient clinic as “cerebral palsy” treatment did not improve, 4 days to cough and fever into