How did Betsy Arakwa get Hantavirus?

Arakawa and her husband, actor Gene Hackman, were found dead last month at their New Mexico home. Her cause of death was determined to be hantavirus pulmonary syndrome. Hantavirus is extremely rare. So how did Betsy get this disease and what exactly is it? Joining LiveNOW's Josh Breslow to break it all down is Dr. Scott Roberts with the Yale School of Medicine.