Causal DAG — vaccine effectiveness
Test-negative design with healthcare seeking as confounder.
Make it your own.
title "Vaccine effectiveness (test-negative design)"
exposure V "Vaccination"
outcome I "Infection"
confounder H "Healthcare seeking"
confounder A "Age & comorbidity"
mediator E "Immune response"
V -> E
E -> I
H -> V
H -> I
A -> V
A -> I