dan barouch hasn't taken a day off, working long hours to develop a vaccine to help stop the spread ofhe outbreak. >> vaccine developments of covid-19 is proceeding at a pace that is far faster than any vaccine development in history. >> reporter: dr. barouch is the director of the center for virology and vaccine research at beth israel deaconess medical center. he has led groundbreaking work on vaccines for h.i.v and zika. are you concerned you are moving too fast? >> the goal is not to compromise patient safety at all. because ultimately a vaccine absolutely must be safe, if it is going to be administered to large numbers of healthy people. >> reporter: researchers are taking part of the coronavirus d.n.a. and transferring it into weakened common cold virus. after it is placed into a cell, the body will produce antibodies triggering an immune response. >> we know from using this vaccine technology for other pathogens in the past, that it raises remarkably potent and durable neutralizing antibody responses. >> reporter: barouch believes this approach will allow them to quickly mass-pr