By Joseph Gamp The world’s leading health authority has called on global leaders to sign a pandemic treaty to help nations prepare for “Disease X” amid the threat of new major health pandemics Speaking at the World Economic Forum in Davos on Wednesday, Tedros Ghebreyesus, director-general of the World Health Organisation (WHO), urged countries to sign on to its pandemic treaty by May in order to fight the “common enemy”. Disease X is a hypothetical “placeholder” virus that has not yet been formed, but scientists say it could be 20 times deadlier than COVID-19. Disease X was added to the WHO’s …