The triple burden of flu, RSV and COVID-19
![](https://ukhsa.blog.gov.uk/wp-content/uploads/sites/33/2023/02/shutterstock_98504084-1-1024x683.jpg)
In November 2022 the SARS-CoV2 Immunity and Reinfection Evaluation study, or SIREN for short, expanded to study flu and Respiratory Syncytial Virus (RSV). This blog explains what we hope to learn from this work.