Zombie viruses' could trigger deadly pandemics in future: All you need to know Ancient viruses can make a comeback and cause pandemics, scientists warning. The Arctic's frozen soil, known as permafrost, is melting due to global warming. Scientists believe it could potentially unleash 'zombie viruses' which can trigger new disease outbreaks. Zombie virus refers to pathogens which were dormant but still half-alive and hidden for thousands of years. @dikhitbhumika decodes #zombie, #zombievirus, #ch