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一九八七年二月,汝阳县柏树乡发生了一起流行性感冒(简称流感),经流行病学、病原学、血清学证实系由甲型流感病毒引起的爆发流行,情况报告如下:
In February 1987, an influenza epidemic occurred in Cypress Township, Ruyang County. The epidemic, etiology and serology confirmed the outbreak of influenza A (H1N1). The situation is reported as follows: