加拿大的麻疹:模拟疫情爆发与不同的疫苗覆盖率和干预措施
Jennifer McNichol1, Javad Valizadeh2, Samara Chaudhury2
1Department of Mathematics, Simon Fraser University, Burnaby, British Columbia, Canada. jmcnicho@sfu.ca.
BMC infectious diseases
|February 19, 2025
概括
在加拿大,高的麻疹疫苗接种率,达到95%或以上,可以防止大多数疫情爆发. 在85%以下的覆盖率下,麻疹疫情仍然可能发生,其规模取决于干预和社区因素.
科学领域:
- 流行病学 流行病学
- 数学建模的数学建模
- 公共卫生 公共卫生
背景情况:
- 全球麻疹发病率正在上升,对加拿大等国家构成风险,这些国家以前拥有消除状态.
- 虽然大多数加拿大人都接种了疫苗,但疫苗接种率较低的地区仍然存在,这增加了对进口麻疹病例的脆弱性.
- 加拿大的麻疹消除状况受到进口病例的威胁,特别是在疫苗接种率低于最佳的社区.
研究的目的:
- 为了模拟进口后加拿大的潜在麻疹疫情.
- 评估不同疫苗接种覆盖率和公共卫生干预措施对疫情动态的影响.
- 为在加拿大本地情景中预测麻疹疫情规模和持续时间提供一个工具.
主要方法:
- 开发一个随机易受-暴露-感染-恢复 (SEIR) 模型.
- 在不同的场景下模拟麻疹进口到加拿大的模拟.
- 模型生成的疫情数据与现实世界麻疹疫情报告的比较.
主要成果:
- 在社区一级,麻疹疫情可以控制在85%或以上的疫苗接种覆盖率上.
- 超过95%的疫苗接种覆盖率,99%的麻疹引入不会导致疫情爆发.
- 疫情的规模和持续时间受到疫苗接种覆盖率,社区规模和干预强度的重大影响,疫情通常持续60天以下.
结论:
- 开发的模型有助于将全球麻疹风险与加拿大当地环境联系起来.
- 该模型预测了在进口到加拿大的麻疹疫情的潜在持续时间和规模.
- 这种投影能力可以为公共卫生反应提供信息,并向加拿大公众传达与麻疹相关的风险.
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