Nigeria's President Muhammadu Buhari arrival at airport in Abuja

FILE - In this Aug. 19, 2017, file photo released by the Nigeria State House, Nigeria's President Muhammadu Buhari, center, walks upon his arrival at the airport in Abuja, Nigeria, after returning from more than three months in London for medical treatment. The coronavirus pandemic could narrow one gaping inequality in Africa, where some heads of state and other elite jet off to Europe or Asia for health care unavailable in their nations but as global travel restrictions tighten, they might have to take their chances at home. (Sunday Aghaeze/Nigeria State House via AP, File)