When Bagama Guehara walked out of Donka Hospital in Guinea’s capital, Conakry, on 7 July this year, leaning on a walking stick for support, she was met with rapturous applause from the medical staff and fellow patients. At 99, Guehara is the oldest person to have tested positive for Covid-19 in Guinea since the country’s first positive case was detected on 13 March 2020.