A steady, steep rise in COVID-19 activity has left many nations, especially lower-income countries, with shortages of medical oxygen, which plays a vital role in treating patients, and efforts are under way to boost supplies, the head of the World Health Organization (WHO) said today.The pandemic total today rose to 9,330,883 cases, and 479,496 people have died from their infections, according to the Johns Hopkins online dashboard.Rising cases push oxygen demand past supplyAt a WHO media briefing today, WHO Director-General Tedros Adhanom Ghebreyesus, PhD, said news stories published today have highlighted the role of oxygen in treating COVID-19 patients, and strategies to boost supply have been an intense focus since the pandemic began.As