"If hypoxic patients - where there's a lack of oxygen in the blood - are put on a waiting list for high-flow nasal oxygen, they are in all likelihood waiting to die,” she wrote, appealing to people to wear masks and practice social distancin.Although South Africa's two largest oxygen suppliers, Afrox and Air Liquide, have increased production, the hospitals will still not get enough for their demands due to a serious shortages of cylinders and drivers and vehicles to distribute oxygen.