The WHO wants masks to become a symbol of global solidarity.(ABC Wide Bay: Brad Marsellos)ShareFacebookTwitterArticle share optionsShare this onFacebookTwitterLinkedInSend this byEmailMessengerCopy linkWhatsAppPrint contentPrint with images and other mediaPrint text onlyPrintCancelThe World Health Organization (WHO) has warned that while there was hope for a coronavirus vaccine, researchers still may not discover one that works and even if they do it could provide only limited protection from the virus.Meanwhile, Singapore is making electronic monitoring devices mandatory for arriving travellers in quarantine.This story will be updated throughout Tuesday and was last updated at 2:30am.Tuesday's key moments:Singapore to make travellers wear electronic tags during quarantineTahiti cruise ship hit with coronavirusRussia to deliver anti-viral drug to South Africa and Latin American countriesVietnam to stick with localised lockdowns after new coronavirus outbreakUK to use rapid tests to reach 500,000-a-day targetMainland China sends testing team to Hong Kong for first timeWHO warns there may never be a 'silver bullet' for COVID-19The World Health Organization has warned 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.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, handwashing and testing."The message to people and governments is clear: 'Do it all'," Dr Tedros told a virtual news briefing from the UN body's headquarters in Geneva. He said face masks should become a symbol of solidarity round the world. WHO Director-General Tedros Adhanom Ghebreyesus has urged all countries to ensure people take all possible health measures to fight the coronavirus.(AP: Salvatore Di Nolfi/Keystone)"A number of vaccines are now in phase three clinical trials and we all hope to have a number of effective vaccines that can help prevent people from infection," he said. "However, there's no silver bullet at the moment,
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