National influenza mid-season report, 2020-2021.
National influenza mid-season report, 2020-2021.
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DOI：
10.14745/ccdr.v47i01a01
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发表时间：
2021-01-29
期刊：
影响因子：
--
通讯作者：
Bancej, Christina
中科院分区：
文献类型：
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作者：
Lee, Liza;Butt, Kelly;Bancej, Christina
加拿大的全国流感季节通常从11月下旬（第47周）开始，定义为至少5%的流感检测呈阳性且至少观察到15次阳性检测的一周。截至2020年12月12日（第50周），2020-2021年流感季节尚未开始。从2020年8月23日至12月12日，仅报告了47例实验室确认的流感检测;尽管流感检测水平高于正常水平，但这一数字仍是前所未有的低。在这少量检测中，64%为甲型流感，36%为B型流感。与前五个季节相比，加拿大的流感活动处于历史最低水平。各省和地区没有报告与流感相关的成人住院。儿科定点住院网络报告的住院病例不到5例。由于流感传播较少，国家微生物实验室尚未收到2020-2021年流感季收集的流感病毒样本，以进行菌株表征或抗病毒耐药性测试。对流感疫苗有效性的评估通常在3月中旬进行，如果季节性流感持续低流行，预计评估也同样有限。尽管如此，加拿大的流感监测系统仍然稳健，并已将其症状、病毒学和严重后果系统组成部分转向支持2019年冠状病毒病（COVID-19）监测。尽管COVID-19大流行，流感流行和大流行的威胁仍然存在。当务之急是：1）保持对流感的监测，2）对不寻常或意外事件保持警惕，3）做好准备，在流感疫情再次爆发时减轻疫情。
Canada's national influenza season typically starts in the latter half of November (week 47) and is defined as the week when at least 5% of influenza tests are positive and a minimum of 15 positive tests are observed. As of December 12, 2020 (week 50), the 2020-2021 influenza season had not begun. Only 47 laboratory-confirmed influenza detections were reported from August 23 to December 12, 2020; an unprecedentedly low number, despite higher than usual levels of influenza testing. Of this small number of detections, 64% were influenza A and 36% were influenza B. Influenza activity in Canada was at historically low levels compared with the previous five seasons. Provinces and territories reported no influenza-associated adult hospitalizations. Fewer than five hospitalizations were reported by the paediatric sentinel hospitalization network. With little influenza circulating, the National Microbiology Laboratory had not yet received samples of influenza viruses collected during the 2020-2021 season for strain characterization or antiviral resistance testing. The assessment of influenza vaccine effectiveness, typically available in mid-March, is expected to be similarly limited if low seasonal influenza circulation persists. Nevertheless, Canada's influenza surveillance system remains robust and has pivoted its syndromic, virologic and severe outcomes system components to support coronavirus disease 2019 (COVID-19) surveillance. Despite the COVID-19 pandemic, the threat of influenza epidemics and pandemics persists. It is imperative 1) to maintain surveillance of influenza, 2) to remain alert to unusual or unexpected events and 3) to be prepared to mitigate influenza epidemics when they resurge.