An engineer operates an ultra-cold freezer the government recently purchased to store COVID-19 vaccines in Kigali, Rwanda, Jan 22, 2021. Hassan Sibomana, head of Rwanda Biomedical Center's vaccination unit, said Rwanda has addressed the challenge of storing COVID-19 vaccines at low temperatures, and has built the capacity to store about 300,000 vaccine doses. (Photo by Cyril Ndegeya/Xinhua)
