GENEVA : The World Health Organization warned on Monday that there might never be a "silver bullet" for COVID-19 in the form of a perfect vaccine and that the road to normality would be long, with some countries requiring a reset of strategy.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 nations to rigorously enforce health measures such as mask-wearing, social distancing, hand-washing and testing."The message to people and governments is clear: 'Do it all',".