This image offers a striking example of exactly what happens to cells in the human airway when this coronavirus infects them. This colorized scanning electron microscope (SEM) image shows SARS-CoV-2-infected human lung cells (purple) covered in hair-like cilia (blue). Emerging from the surface of those infected airway cells are many thousands of coronavirus particles (red). They first cultured cells from the lining of a human airway, then inoculated them with the virus. The image illustrates the astoundingly large number of viral particles that can be produced and released from infected human cells.