With the global COVID-19 total now over 16 million, the head of the World Health Organization (WHO) said today that pandemic activity is accelerating, with fresh clusters reported in Vietnam, a country that had controlled the spread of the virus.The pandemic total made the jump from 15 million to 16 million in just 4 days, and today the number has reached 16,350,348 cases, and 650,553 people have died from their infections, according to the Johns Hopkins online dashboard.WHO: Cases doubled over last 6 weeksAt a media briefing today, WHO Director-General Tedros Adhanom Ghebreyesus, PhD, said cases have roughly doubled over the past 6 weeks.