As the global total passed 900,000 COVID-19 cases today, the World Health Organization (WHO) director-general said he is deeply concerned about the rapid escalation in cases and the wide reach of the virus, which now threatens to bear down on low-income countries with fragile health systems.Spurred mainly by rapidly growing pandemic activity across Europe and the United States, the global total today is at 926,924 cases in 180 countries, which includes 46,252 deaths, according to the Johns Hopkins online dashboard.As virus activity enters its fourth month, WHO Director-General Tedros Adhanom Ghebreyesus, PhD, said today at a telebriefing that the world is witnessing nearly exponential growth, and deaths have more than doubled in the past