Also Read | The fear of flying at Mount 50K"We've been working very hard to ensure that all countries, all populations, do have the opportunity to access these vaccines," she told a WHO social media live event.Simao said that around 50 countries have started vaccination campaigns, with more than 40 of them being high-income states.The WHO co-led Covax facility, a globally-pooled vaccine procurement and distribution effort, has struck agreements with five manufacturers for two billion vaccine doses.It aims to secure vaccines for 20 percent of the population in each participating country by the end of the year, with funding covered for the 92 lower- and lower-middle income economies involved."We are expecting to have the first doses reaching.