<span style="color: #222222;">Abba Kyari, the  Chief of Staff to Nigeria's president Muhammadu Buhari has died from Covid-19 after a nearly month-long infection.<br />'' <br />'' Kyari  was in his 70s and had underlying health problems including diabetes. He was the top official aide to 77-year-old President Muhammadu Buhari. The late chief of staff was said to have contracted the coronavirus on an official trip in March.  </span><br />