1987年2月末3月初衡阳市许多中学突然发生大量病因不明的红斑性肢痛症病例。我们对病例较多的衡南县二中进行了环境流行病学调查。 1.临床和流行病学特征:患者主要为对称性双下肢末端阵发性疼痛,足趾红肿和发热,夜间疼痛较白昼剧烈,疼痛发作时给予浸冷水或夜间将患肢露出被外均可暂时缓 Late February 1987 early March many large schools in Hengyang suddenly a large number of etiology of erythema arrhythmia cases. We conducted an environmental epidemiological survey of two counties in Hengnan County, which had more cases. 1. Clinical and epidemiological characteristics: Patients are mainly symmetrical at the end of both lower extremities paroxysmal pain, toe swelling and fever, night pain more intense than during the day, when the pain was given dip cold water or exposed at night outside the limb may be exposed Temporarily slow