How do we measure how well the flu vaccine works every year? We use an observational study called the "test negative design." A few tweets on how it works, and why it will be a big part of ongoing COVID-19 vaccine evaluation. 1/8
— Natalie E. Dean, PhD (@nataliexdean) February 15, 2021
Figure source: Fukushima et al. (2017) Vaccine pic.twitter.com/7saSMWA9bb
Tagged COVIDVaccine studies