One of the world's largest cruise lines, Norwegian, has become the first major cruise line to end all of its vaccination requirements. So is now the time to book a cruise?

To answer your questions, KCBS Radio's Margie Shafer and Eric Thomas spoke with Dr. Robert Siegel, professor in the Department of Microbiology and Immunology at Stanford University.

If you have a question you would like answered, please email us at: AskUs@KCBSRadio.com.