title: The disease X: waiting for the next pandemic
abstract: In 2008 the WHO published a report on infectious diseases against which there is no effective treatment or vaccines and therefore – diseases able to cause pandemic. In addition, so called disease X was mentioned – potentially deadly, with no herd immunity against it, holding pandemic potential, unknown in medicine yet. In 2019 such disease X was COVID-19. There is a plausibility, that next pandemic will be induced by zoonotic RNA virus (alike SARS-CoV-2) infecting people in place of intensified 
journal: Polish Journal of Public Health