My two cents (not knowing anything about biology/pandemics):
If you want to do almost anything related to science of any kind, I would recommend getting a solid grounding in math, statistics, and computer programming in addition to your content-specific studies (e.g. biology or epidemiology). This will give you vastly greater options to adjust your career as you go than if you just do some specific content area (e.g. biology). It will also likely also help you understand the particular content area much better.
Toward this end, I would consider doing a double major like 1) math, statistics, or computer science and 2) your content area [e.g. biology]. If you can only do one major, I would choose the technical major (e.g. applied math) rather than the content major (e.g. bio).