With more people succumbing to Mers-CoV in Saudi Arabia, health officials are on alert. Mike Hanna speaks to Mohammed Al Hajri, manager of Health Protection & Communicable Diseases at the Supreme Council of Health, Dr Daniel Lucey, adjunct professor of Microbiology and Immunology at Georgetown University Medical Center and Dr Ben Neuman, a virologist at the University of Reading who's studied coronaviruses for 17 years.