Colorado Puts Vaccine From Johnson & Johnson On Hold — Here’s What To Know As It’s Under Investigation

“These are two of the potentially really lifesaving vaccines for the world. The AstraZeneca in particular, because it's so cheap, it's so relatively easy to manufacture, and I think 3 billion doses are slated for the rest of the world and has the potential to save a ton of lives,” said Dr. Sean O’Leary a pediatric infectious disease specialist at Children's Hospital Colorado.