MICHAEL SHIELDS and EMMA FARGE THE World Health Organization warned on Monday that, despite strong hopes for a vaccine, there might never be a "silver bullet" for COVID-19, and the road to normality would be long. More than 18.14 million people around the world are reported to have been infected with the disease and 688,080​ have died, according to a Reuters tally, with some nations that thought they were over the worst experiencing a resurgence. WHO Director-General Tedros Adhanom Ghebreyesus and WHO emergencies head Mike Ryan exhorted all nations to rigorously enforce health measures such as mask-wearing, social distancing, hand-washing…