Researchers across the world are working on a vaccine for the virus that has infected 16 million people in the past six months.(AP: Charles Krupa)ShareFacebookTwitterArticle share optionsShare this onFacebookTwitterLinkedInSend this byEmailMessengerCopy linkWhatsAppPrint contentPrint with images and other mediaPrint text onlyPrintCancelThe rate of coronavirus spread around the globe remains a large concern for the World Health Organization with case numbers globally doubling in the last six weeks.Meanwhile, in the US, the world's biggest vaccine trial has entered the final stages of testing as thousands of study participants across the country are injected with the test vaccine.This story was last updated at 2:00am TuesdayTuesday's key moments:Global cases double in past six weeksMutation may have made virus more vulnerable to vaccinesNew heart problems seen in recovered COVID-19 patientsUS vaccine enters late-stage trialHong Kong makes masks compulsory, further tightens restrictionsIndonesia passes 100,000 casesCatalonian leader blames youth for virus spreadFlorida overtakes New York in casesPandemic 'continues to accelerate' The outbreak of COVID-19 is easily the worst global health emergency the WHO has faced, says its director.(AP: Mahesh Kumar A.)The coronavirus pandemic "continues to accelerate", with a doubling of cases over the last six weeks, the World Health Organization chief says.More than 16 million cases have now been reported to the UN health agency, with more than 640,000 deaths worldwide.This Thursday will mark six months since the WHO declared COVID-19 an international public health emergency.It is easily the worst global health emergency the WHO has faced, Director-General Tedros Adhanom Ghebreyesus said."COVID-19 has changed our world. It has brought people, communities and nations together,
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