Nowcasting outbreak case and death counts from open-source reporting: a validation on the 2026 Ebola (Bundibugyo) outbreak in the Democratic Republic of the Congo
· 2026-09-08 · 原文
DOI：10.64898/2026.09.05.26362336v1?rss=1
Official outbreak counts are authoritative but published with delay. Between situation reports, a response team either works from a number that is several days old or extrapolates the official trend forward. We assess whether open-source reporting can reduce this gap. On the 2026 DRC Ebola outbreak we reconstruct the cumulative case and death curves from open sources, anchor them to the latest official figure, and project to the present. In a real-time (vintage) backtest over roughly ten weeks, using only reports available at each point, the open-source nowcast is comparable to simple extrapolation when the official figure is fresh, but once the official figure is stale by four to five days for cases, and about six for deaths, it is materially more accurate, cutting the median case-count e
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讲义·推断 依据「原文」自动生成的结构化摘要（推断），非原文表述；以原文为准。
1. 人话版
Official outbreak counts are authoritative but published with delay.
Between situation reports, a response team either works from a number that is several days old or extrapolates the official trend forward.
2. 领域脉络
We assess whether open-source reporting can reduce this gap.
3. 机制拆解
摘要未展开方法细节——精读时重点看方法/模型部分。
4. 证据与数字
On the 2026 DRC Ebola outbreak we reconstruct the cumulative case and death curves from open sources, anchor them to the latest official figure, and project to the present.
5. 反例与边界
In a real-time (vintage) backtest over roughly ten weeks, using only reports available at each point, the open-source nowcast is comparable to simple extrapolation when the official figure is fresh, but once the official figure is stale by four to five days for cases, and about six for deaths, it is materially more accurate, cutting the median case-count e
6. 跨领域连接与意外收获
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7. 可复用方法
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8. 术语表
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