# The need for a clinical case definition in test-negative design studies estimating vaccine effectiveness

> Research article (npj Vaccines, 2023) · cited 20× · AI/ML

**Wikidata**: [openalex:W4385780381](https://www.wikidata.org/wiki/openalex:W4385780381)  
**Source**: https://4ort.xyz/entity/the-need-for-a-clinical-case-definition-in-test-negative-design-studies-estimating-vaccine-effectiveness