Doctors have outlined a nightmare scenario of never ending pandemic if political leaders fail to vaccinate the entire world. As European countries squabble to secure COVID-19 vaccines, experts have warned that any move to stockpile could create more mutant strains. It means that even if Australia achieves herd immunity, the failure to vaccinate our region and the world could create new and virulent strains that render our own vaccines ineffective and bring the pandemic roaring back to life. Â One of the world s most eminent COVID-19 experts, Dr Ashish K. Jha, is a physician and dean of the school of health at Brown University. He warns the threat is real.