Establishing thresholds for influenza surveillance in Victoria
Establishing thresholds for influenza surveillance in Victoria
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DOI：
10.1111/j.1467-842x.2003.tb00418.x
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发表时间：
2003-08-01
影响因子：
3.5
通讯作者：
Kelly, HA
中科院分区：
文献类型：
--
作者：
Watts, CG;Andrews, RM;Kelly, HA
目的：我们旨在评估维多利亚州连续5个流感季节中可归因于流感感染的流感样疾病(ILI)的比例，将ILI活动与流感住院人数进行比较，并制定ILI活动何时可能与流感住院人数增加相一致的阈值。方法：在维多利亚州传染病参考实验室，从哨兵全科选择ILI患者的鼻咽拭子中检测流感和其他呼吸道病毒。1998年至2002年连续五个监测季节评估了实验室确认的流感引起的ILI的比例。比较了2000-02年间ILI和实验室确认的流感的季节性模式。将1997-2000年哨兵全科医院ILI监测与1994年至2000年维多利亚住院病例集流感住院人数进行比较。结果：1998-2002年哨兵全科ILI病例中约有41%确诊为流感感染。在三个流感季节中，从哨兵全科医生中挑选的患者的ILI和确诊流感的季节性模式非常相似。哨兵全科医生的ILI发生率的趋势似乎与流感住院的趋势非常相关。ILI阈值定义为：基线1.5-3.5；疫情活动3.5以上。结论：哨兵全科住院编码为流感的ILI发生率与住院人数相对应，允许使用阈值来描述季节性流感活动。
Objective: We aimed to review the proportion of influenza-like illness (ILI) that could be attributed to influenza infection over five consecutive influenza seasons in Victoria, to compare ILI activity with hospital admissions for influenza, and to develop thresholds that would indicate when ILI activity may coincide with increases in influenza hospitalisations.Methods: Combined nose/throat swabs from patients with ILI selected from sentinel general practices were tested for influenza and other respiratory viruses at the Victorian Infectious Diseases Reference Laboratory. The proportion of ILI attributed to laboratory-confirmed influenza was evaluated for five consecutive surveillance seasons, from 1998 to 2002. The seasonal patterns of ILI and laboratory-confirmed influenza were compared for 2000-02. ILI surveillance from sentinel general practices between 1997 and 2000 was compared with hospital admissions for influenza extracted from the Victorian Admitted Episodes Dataset between 1994 and 2000.Results: Approximately 41% of all ILI cases from sentinel general practices were confirmed to have an influenza infection between 1998 and 2002. The seasonal pattern of ILI and confirmed influenza among patients selected from sentinel general practices was very similar over three influenza seasons. The trends for ILI rates in sentinel general practices appeared to correlate remarkably well with those of hospital admissions for influenza. Thresholds for ILI were defined as: baseline 1.5-3.5; and epidemic activity above 3.5.Conclusion: ILI rates from sentinel general practices correspond with hospital admissions coded as influenza and allow the use of threshold levels to describe seasonal influenza activity.