Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
MMWR Morb Mortal Wkly Rep. 2018 Dec 14;67(49):1369-1371. doi: 10.15585/mmwr.mm6749a4.
Influenza activity in the United States was low during October 2018, and, although it increased slowly during November, activity remains low across most of the country.* During the week ending December 1, 2018, the percentage of outpatient visits for influenza-like illness (ILI) was equal to the national baseline (Figure) and was at or slightly above the region-specific baseline in four of the 10 U.S. Department of Health and Human Services regions (Regions 4 and 7-9). The majority of jurisdictions experienced minimal or low ILI activity since September 30; however, two experienced moderate ILI activity, and two experienced high ILI activity** during the week ending December 1. The percentage of deaths attributed to pneumonia and influenza remains below the epidemic threshold, and the rate of influenza-associated hospitalizations remains low. Five laboratory-confirmed, influenza-associated pediatric deaths occurring since September 30 have been reported to CDC. During the week ending December 1, the majority of jurisdictions (40 states, the District of Columbia, Puerto Rico, and U.S. Virgin Islands) reported sporadic or local geographic spread of influenza activity, nine states reported regional activity, and one state reported widespread activity..
2018 年 10 月美国流感活跃度较低，11 月虽缓慢上升，但大部分地区仍处于低活跃度。* 截至 2018 年 12 月 1 日的一周内，流感样疾病（ILI）的门诊就诊率与全国基线持平（图），在卫生与公众服务部 10 个地区中的 4 个地区（第 4 和第 7-9 区）达到或略高于地区特定基线。自 9 月 30 日以来，大多数地区的 ILI 活动处于最低或低水平；然而，有两个地区的 ILI 活动处于中等水平，有两个地区的 ILI 活动处于高水平。** 归因于肺炎和流感的死亡百分比仍低于流行阈值，流感相关住院率仍处于低水平。自 9 月 30 日以来，CDC 报告了 5 例经实验室确诊的与流感相关的儿科死亡病例。截至 12 月 1 日的一周内，大多数地区（40 个州、哥伦比亚特区、波多黎各和美属维尔京群岛）报告流感活动呈散发性或局部地理传播，9 个州报告区域性活动，1 个州报告广泛活动。
