Since the COVID-19 crisis emerged, the importance of reliable, accessible testing to screen for the disease has become increasingly clear. Right now, there are several ways of testing, but none of them are perfect. What types of COVID-19 diagnostics are there? Which alternatives are being developed? Infectious disease epidemiologist Prof Janneke van de Wijgert (UMC Utrecht) discusses the role they could play in controlling the current pandemic, and possibly, future outbreaks.