Modern technology and international cooperation could limit the coronavirus pandemic to less than two years, says the World Health Organisation (WHO) chief.“Hoping we can have additional tools like a vaccine, I think we can finish it in a shorter time than the 1918 flu,” Tedros Adhanom Ghebreyesus said in a news conference in Geneva, referring to the Spanish flu pandemic that claimed tens of millions of lives until 1920.As new Covid-19 strain spreads across Asia, should we be worried?While the…