Quoted: “At any given moment if we were to swab you?we?d probably come up with five different rhinoviruses sitting in your nose but you?re not sick,” said Ann Palmenberg, a researcher at the Institute of Molecular Virology at the University of Wisconsin-Madison. Rhinovirus is the most common viral cause of the common cold, accounting for 30% to 50% of adult colds, and there are more than 150 strains of it.