Harvard’s Marc Lipsitch said evidence indicates that the international cordon keeping coronavirus cases bottled up in China is a leaky one, and it’s likely that the relative handful of global cases reported so far are undercounted. If true, that will lead to widespread illness internationally, including in the U.S.

As the number of coronavirus cases rapidly grows, the Gazette spoke with Professor of Epidemiology Marc Lipsitch, an expert in the spread of infectious disease and director of the Center for Communicable Disease Dynamics.