In a statement released on March 29, Kyari said he had been transferred to Nigeria's biggest city Lagos for private medical treatment and hoped "to be back at my desk very soon."
The central government has imposed a lockdown on Nigeria's economic hub Lagos and capital Abuja, while state governors have ordered a raft of measures in other regions.
Experts said the country of 200 million is highly vulnerable to the spread of the disease given its weak healthcare system and high population density.
Earlier, Director-General of the WHO Tedros Adhanom Ghebreyesus has expressed concerns over increasing confirmed cases across the continent, saying the trends are worrying.
Africa could have 1.2 billion infections due to novel coronavirus and lose 3.3 million lives, according to a new report by the United Nations Economic Commission for Africa (UNECA) released on April 17, 2020.
(Cover: File photo of Abba Kyari. /Nigeria State House)