How do cells spread the word during a viral infection?

Why do some people experience few symptoms, while others become seriously ill, when infected with a virus such as the flu or COVID-19? Ph.D. researcher Laura Van Eyndhoven sought to answer this question by looking at cells one cell at a time. Her research provides valuable insights on how individual immune cells influence systemic immunity, which could lead to personalized therapies for cancer and autoimmune diseases in the future.