Causal Vaccine Effects on Post-infection Outcomes in the Naturally Infected
自然感染人群中疫苗对感染后结局的因果效应AI 解读 ↓
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自然感染人群中疫苗对感染后结局的因果效应
- 研究问题
- 疫苗同时影响感染发生与感染后结局，如何定义涵盖预防感染收益的效应，而不局限于无论是否接种都会感染的人群？
- 方法与思路
- 作者以未接种时会感染者为目标定义效应，推导弱假设下的界，并在排除限制或部分主层可忽略性下建立点识别与一步估计。
- 材料陈述的贡献
- 摘要称给出识别界、有效一步估计及特定稳健性结果，并说明同一泛函何时可解释为充分暴露人群效应；试验重分析提示保护效应。
- 阅读关注点
- 应核对目标主层与结局定义、点识别假设及替代暴露解释成立条件，区分宽界提供的信息与依赖主层假设的应用结论。
- 阅读边界
- 这是 arXiv 预印本，不能据此认定已同行评审或期刊接收；摘要称界常较宽，保护效应依赖识别假设，未说明完整条件。
原文摘要
Understanding vaccine effects on post-infection outcomes is critical for evaluating the full value proposition of a vaccine. However, defining appropriate causal effects on such outcomes is challenging because infection is affected by vaccination. Existing approaches focus on the Doomed stratum, individuals who would be infected regardless of vaccine receipt. For many relevant outcomes, however, this estimand understates vaccine benefit by excluding individuals whose adverse post-infection outcomes improve because vaccination prevented infection. We therefore propose causal estimands for post-infection outcomes in the Naturally Infected, individuals who would be infected in absence of vaccine. We derive bounds under minimal assumptions and give point identification results under an exclusion restriction and/or a partial principal ignorability assumption. For point-identified settings, we develop efficient one-step estimators with robustness properties under inconsistent nuisance parameter estimation. We further show under what conditions the same identification functional can be interpreted as targeting an effect among individuals exposed to a sufficiently infectious dose of the pathogen, thereby avoiding reliance on cross-world parameters and fundamentally untestable causal assumptions. Simulations show that the bounds are valid but often wide, and that the point estimators perform well when their identifying assumptions hold. In a reanalysis of a rotavirus vaccine trial, marginal and Doomed-stratum analyses showed little evidence of an effect on antibiotic use, whereas analyses targeting the Naturally Infected suggested a protective effect under principal ignorability-based assumptions.