At the University of Wisconsin, a breakthrough on the common cold front. Researchers construct a model of rhinovirus C and show how it differs from rhinoviruses A and B. ?We previously assumed all rhinoviruses would be the same as each other, and it turns out that they?re not,? said biochemistry professor Ann Palmenberg. That discovery goes a long way towards explaining why drug trials targeting rhinoviruses haven?t been very successful. ?We now understand why the rhinovirus C is different than the A and B, and why the previous drug trials did?t work.?