MMWR Morb Mortal Wkly Rep. 2004 Jan 2;52(51-52):1255-7.
Influenza activity in the United States continued to increase during December 14-20, 2003. The proportion of patient visits to sentinel providers for influenza-like illness (ILI) overall was 7.7%, which is above the national baseline of 2.5%. Influenza activity was reported as widespread by health departments in 45 states, New York City, and the District of Columbia; four states reported regional influenza activity; and one state reported local influenza activity.
2003年12月14日至20日期间，美国流感活动持续增加。前往定点医疗机构就诊的流感样疾病（ILI）患者比例总体为7.7%，高于2.5%的全国基线水平。45个州、纽约市和哥伦比亚特区的卫生部门报告流感活动呈广泛分布；4个州报告有区域性流感活动；1个州报告有局部流感活动。
