UW–Madison Smart Restart: For information about fall semester instruction and campus operations, please visit For COVID-19 news updates, see

Why isn’t there a cold vaccine? Ann Palmenberg explains.

Why isn’t there a cold virus? It’s because rhinovirus, which causes the common cold, comes in more than 100 different types that are particularly confusing to the immune system, Ann Palmenberg, UW–Madison virologist, explains in the “Curiosities” column at